Class 7 – Samacheer Kalvi

Samacheer Kalvi 7th Tamil Book Answers Solutions Guide

Samacheer Kalvi 7th Tamil Guide Pdf Free Download

Samacheer Kalvi 7th Tamil Book Back Answers

Tamilnadu State Board Samacheer Kalvi 7th Tamil Book Back Answers Solutions Guide Term 1, 2, 3.

Samacheer Kalvi 7th Tamil Book Solutions Term 1

Samacheer Kalvi 7th Tamil Book Solutions Term 2

Samacheer Kalvi 7th Tamil Book Solutions Term 3

We hope the given Tamilnadu State Board Samacheer Kalvi 7th Tamil Book Answers and Solutions Guide Pdf Free Download of Term 1, 2, 3 will help you. If you have any queries regarding TN State Board New Syllabus Samacheer Kalvi 7th Standard Tamil Guide Pdf of Book Back Questions and Answers, Chapter Wise Important Questions, Study Material, Question Bank, Notes, drop a comment below and we will get back to you at the earliest.

Samacheer Kalvi 7th Tamil Book Answers Solutions Guide Read More »

Samacheer Kalvi 7th Social Science Book Answers Solutions Guide

Leave a Comment / Class 7 / By Prasanna

Expert Teachers at SamacheerKalvi.Guru has created Tamilnadu State Board Samacheer Kalvi 7th Social Science Book Answers and Solutions Guide Pdf Free Download of History, Geography, Civics, Economics Term 1, 2, 3 in English Medium and Tamil Medium are part of Samacheer Kalvi 7th Books Solutions. Here we have given TN State Board New Syllabus Samacheer Kalvi 7th Std Social Science Guide Pdf of Book Back Questions and Answers, Chapter Wise Important Questions, Study Material, Question Bank, Notes.

Samacheer Kalvi 7th Standard Social Science Guide in English Medium

Samacheer Kalvi 7th Social Science Book Back Answers

You can download Tamilnadu State Board Samacheer Kalvi 7th Social Science Book Answers and Solutions Guide Pdf of History, Geography, Civics, Economics Term 1, 2, 3.

Samacheer Kalvi 7th Standard Social Science Guide in English Medium

Samacheer Kalvi 7th Social Science Books Answers Term 1

Samacheer Kalvi 7th Social Science History

Samacheer Kalvi 7th Social Science Geography

Samacheer Kalvi 7th Social Science Civics

Samacheer Kalvi 7th Social Science Economics

Chapter 1 Production

7th Standard Samacheer Kalvi Social Science Guide Term 2

Samacheer Kalvi 7th Social Science History

Samacheer Kalvi 7th Social Science Geography

Samacheer Kalvi 7th Social Science Civics

Samacheer Kalvi 7th Social Science Book Back Answers Term 3

Samacheer Kalvi 7th Social Science History

Samacheer Kalvi 7th Social Science Geography

Samacheer Kalvi 7th Social Science Civics

Samacheer Kalvi 7th Social Science Economics

Chapter 1 Tax and its Importance

Samacheer Kalvi 7th Social Science Book Solutions And Answers Guide Term 3

Samacheer Kalvi 7th Social Science History

Samacheer Kalvi 7th Social Science Geography

Samacheer Kalvi 7th Social Science Civics

Samacheer Kalvi 7th Social Science Economics

Chapter 1 Tax and its Importance

7th Standard Social Science Guide in Tamil Medium Pdf Download

7th Social Science Book Back Questions with Answers in Tamil Medium, 7th Std Social Science Guide Tamil Medium Pdf Free Download 2021-2022, 7th New Social Science Book Back Answers in Tamil Medium.

7th Social Book Back Questions and Answers Term 1

Samacheer Kalvi 7th Social Book Answers History

7th Standard Social Book Answers Geography

7th Std Social Book Answers Civics

7th Guide Social Economics

Chapter 1 உற்பத்தி

Samacheer Kalvi 7th Social Science Book Solutions Term 2

Social Science 7th Guide History

7th Social Science Guide Tamil Medium Geography

7th Samacheer Social Guide Civics

Social Guide for Class 7 Samacheer Kalvi Term 3

7th Social Book Back Answers History

7th Std Social Science Guide Geography

7th Standard Social Science Guide Civics

7th Social Book Back Answers Economics

Chapter 1 வரியும் அதன் முக்கியத்துவம்

We hope the given Tamilnadu State Board Samacheer Kalvi 7th Social Science Book Answers and Solutions Guide Pdf Free Download of History, Geography, Civics, Economics Term 1, 2, 3 in English Medium and Tamil Medium will help you. If you have any queries regarding TN State Board New Syllabus Samacheer Kalvi 7th Standard Social Science Guide Pdf of Book Back Questions and Answers, Chapter Wise Important Questions, Study Material, Question Bank, Notes, drop a comment below and we will get back to you at the earliest.

Samacheer Kalvi 7th Social Science Book Answers Solutions Guide Read More »

Samacheer Kalvi 7th Books Solutions Guide

Tamilnadu Samacheer Kalvi 7th Guide Text Book Back Answers Solutions Pdf Free Download

TN Samacheer Kalvi 7th Book Back Answers Solutions Guide

We hope the given Tamilnadu State Board Samacheer Kalvi Class 7th Books Term 1, 2, 3 Solutions and Answers Pdf Free Download in English Medium and Tamil Medium will help you. If you have any queries regarding TN State Board New Syllabus Samacheer Kalvi 7th Standard Guides Pdf of Book Back Questions and Answers, Chapter Wise Important Questions, Study Material, Question Bank, Notes, Formulas, drop a comment below and we will get back to you at the earliest.

Samacheer Kalvi 7th Books Solutions Guide Read More »

Samacheer Kalvi 7th Science Book Answers Solutions Guide

Leave a Comment / Class 7 / By Prasanna

Expert Teachers at SamacheerKalvi.Guru has created Tamilnadu State Board Samacheer Kalvi 7th Science Book Answers and Solutions Guide Pdf Free Download of Term 1, 2, 3 in English Medium and Tamil Medium are part of Samacheer Kalvi 7th Books Solutions. Here we have given TN State Board New Syllabus Samacheer Kalvi 7th Std Science Guide Pdf of Book Back Questions and Answers, Chapter Wise Important Questions, Study Material, Question Bank, Notes.

Samacheer Kalvi 7th Std Science Guide Free Download in English Medium

Samacheer Kalvi 7th Science Book Back Answers

You can download Tamilnadu State Board Samacheer Kalvi 7th Science Book Answers and Solutions Guide Pdf of Term 1, 2, 3.

Samacheer Kalvi 7th Std Science Guide Free Download in English Medium

7th Standard Science Guide Term 1

7th Std Science Guide Term 2

Samacheer Kalvi 7th Science Book Back Questions and Answers Term 3

Samacheer Kalvi 7th Standard Science Guide in Tamil Medium

7th Science Book Back Questions with Answers in Tamil, 7th Std Science Guide Tamil Medium Pdf Download, 7th New Science Book Back Answers in Tamil 2021-2022.

Science Guide for Class 7 Samacheer Kalvi பருவம் 1

7th Standard New Science Book Back Question Answer பருவம் 2

7th Science Guide Tamil Medium பருவம் 3

We hope the given Tamilnadu State Board Samacheer Kalvi Class 7th Science Book Answers and Solutions Guide Pdf Free Download of Term 1, 2, 3 in English Medium and Tamil Medium will help you. If you have any queries regarding TN State Board New Syllabus Samacheer Kalvi 7th Standard Science Guide Pdf of Book Back Questions and Answers, Chapter Wise Important Questions, Study Material, Question Bank, Notes, drop a comment below and we will get back to you at the earliest.

Samacheer Kalvi 7th Science Book Answers Solutions Guide Read More »

Samacheer Kalvi 7th English Book Answers Solutions Guide

Leave a Comment / Class 7 / By Prasanna

Expert Teachers at SamacheerKalvi.Guru has created Tamilnadu State Board Samacheer Kalvi 7th English Book Answers and Solutions Guide Pdf Free Download of Term 1, 2, 3 are part of Samacheer Kalvi 7th Books Solutions. Here we have given TN State Board New Syllabus Samacheer Kalvi 7th Std English Guide Pdf of Book Back Questions and Answers, 7th Standard Samacheer Kalvi English Grammar Exercises with Answers, Chapter Wise Important Questions, Study Material, Question Bank, Notes.

Samacheer Kalvi 7th English Guide Pdf Free Download

Samacheer Kalvi 7th English Book Back Answers

You can download Tamilnadu State Board Samacheer Kalvi 7th English Book Answers and Solutions Guide Pdf of Term 1, 2, 3.

Samacheer Kalvi 7th English Book Solutions Term 1

Samacheer Kalvi 7th English Prose

Samacheer Kalvi 7th English Poem

Samacheer Kalvi 7th English Supplementary

Samacheer Kalvi 7th English Book Solutions Term 2

Samacheer Kalvi 7th English Prose

Samacheer Kalvi 7th English Poem

Samacheer Kalvi 7th English Supplementary

Samacheer Kalvi 7th English Book Solutions Term 3

Samacheer Kalvi 7th English Prose

Samacheer Kalvi 7th English Poem

Samacheer Kalvi 7th English Supplementary

Samacheer Kalvi 7th English Play

Chapter 1 Jane Eyre

We hope the given Tamilnadu State Board Samacheer Kalvi 7th English Book Answers and Solutions Guide Pdf Free Download of Term 1, 2, 3 will help you. If you have any queries regarding TN State Board New Syllabus Samacheer Kalvi 7th Standard English Guide Pdf of Book Back Questions and Answers, 7th Standard Samacheer Kalvi English Grammar Exercises with Answers, Chapter Wise Important Questions, Study Material, Question Bank, Notes, drop a comment below and we will get back to you at the earliest.

Samacheer Kalvi 7th English Book Answers Solutions Guide Read More »

Samacheer Kalvi 7th Maths Book Answers Solutions Guide

Samacheer Kalvi 7th Maths Guide Pdf Free Download

Samacheer Kalvi 7th Maths Book Back Answers

Tamilnadu State Board Samacheer Kalvi 7th Maths Book Answers Solutions Guide Term 1, 2, 3

Samacheer Kalvi 7th Maths Book Solutions Term 1

Samacheer Kalvi 7th Maths Books Answers Chapter 1 Number System

Samacheer Kalvi 7th Maths Book Solutions Chapter 2 Measurements

7th Std Samacheer Kalvi Maths Guide Free Download Chapter 3 Algebra

Samacheer Kalvi 7th Maths Guide Pdf Free Download Chapter 4 Direct and Inverse Proportion

Samacheer Kalvi 7th Std Maths Book Chapter 5 Geometry

Samacheer Kalvi 7th Maths Solutions Term 1 Chapter 6 Information Processing

Samacheer Kalvi 7th Maths Book Solutions Term 2

Samacheer Kalvi 7th Maths Book English Medium Chapter 1 Number System

Samacheer Kalvi 7th Books Maths Chapter 2 Measurements

Samacheer Kalvi 7th Maths Solutions Term 2 Chapter 3 Algebra

Tamilnadu Board Class 7 Chapter 4 Geometry

Tamil Nadu State Board 7th Std Maths Chapter 5 Information Processing

Samacheer Kalvi 7th Maths Book Solutions Term 3

Samacheer Kalvi 7th Maths Books Answers Chapter 1 Number System

Samacheer Kalvi 7th Maths Book Solutions Chapter 2 Percentage and Simple Interest

7th Std Samacheer Kalvi Maths Guide Free Download Chapter 3 Algebra

Samacheer Kalvi 7th Maths Guide Pdf Free Download Chapter 4 Geometry

Samacheer Kalvi 7th Std Maths Book Chapter 5 Statistics

Samacheer Kalvi 7th Maths Solutions Term 1 Chapter 6 Information Processing

Samacheer Kalvi 7th Maths Guide Tamil Medium Pdf

7th Maths Guide Term 1 பருவம் – I

7th Maths Book Back Answers Chapter 1 எண்ணியல்

7th Class Maths Guide Chapter 2 அளவைகள்

Samacheer Kalvi 7th Maths Books Answers Chapter 3 இயற்கணிதம்

Samacheer 7th Maths Guide Chapter 4 நேர் மற்றும் எதிர் விகிதங்கள்

Maths Guide 7th Class Chapter 5 வடிவியல்

7th Standard Maths Book Answers Chapter 6 தகவல் செயலாக்கம்

7th Standard 2nd Term Maths Guide பருவம் – II

7th Maths Solution Samacheer Kalvi Chapter 1 எண்ணியல்

Seventh Standard Maths Guide Chapter 2 அளவைகள்

7th Maths Samacheer Book Solution Chapter 3 இயற்கணிதம்

7th Class Maths Book Solutions Samacheer Kalvi Chapter 4 வடிவியல்

7th Standard Maths Book Back Answers Chapter 5 தகவல் செயலாக்கம்

7th Standard 3rd Term Maths Guide பருவம் – III

7th Maths Book Back Questions With Answers Chapter 1 எண்ணியல்

7th Maths Guide Samacheer Kalvi Chapter 2 சதவீதமும் தனிவட்டியும்

Class 7 Maths Book Solution Samacheer Kalvi Chapter 3 இயற்கணிதம்

Samacheer Kalvi 7th Standard Maths Guide Chapter 4 வடிவியல்

7th Maths Book Back Questions And Answers Chapter 5 புள்ளியியல்

Samacheer Kalvi 7th Maths Book Back Answers Chapter 6 தகவல் செயலாக்கம்

Chapter 6 தகவல் செயலாக்கம் Ex 6.1

We hope the given Tamilnadu State Board Samacheer Kalvi Class 7th Maths Book Solutions and Answers Pdf Free Download in English Medium and Tamil Medium will help you. If you have any queries regarding TN State Board New Syllabus Samacheer Kalvi 7th Standard Maths Guide Pdf of Book Back Questions and Answers, Chapter Wise Important Questions, Study Material, Question Bank, Notes, Formulas drop a comment below and we will get back to you at the earliest.

Samacheer Kalvi 7th Maths Book Answers Solutions Guide Read More »

Samacheer Kalvi 7th Maths Solutions Term 1 Chapter 2 Measurements Ex 2.2

Leave a Comment / Class 7 / By Prasanna

Students can Download Maths Chapter 2 Measurements Ex 2.2 Questions and Answers, Notes Pdf, Samacheer Kalvi 7th Maths Book Solutions Guide Pdf helps you to revise the complete Tamilnadu State Board New Syllabus and score more marks in your examinations.

Tamilnadu Samacheer Kalvi 7th Maths Solutions Term 1 Chapter 2 Measurements Ex 2.2

Question 1.
Find the area of rhombus PQRS shown in the following figures.

Solution:
(i) Given the diagonals d₁ = 16 cm ; d₂ = 8 cm
Area of the rhombus = \(\frac{1}{2}\)(d₁ × d₂) sq. units
= \(\frac{1}{2}\) × 16 × 8 cm² = 64 cm²
Area of the rhombus = 64 cm²

(ii) Given base b = 15 cm ; Height h = 11 cm
Area of the rhombus = (base × height) sq. units
= 15 × 11 cm² = 165 cm²
Area of the rhombus = 165 cm²

Question 2.
Find the area of a rhombus whose base is 14 cm and height is 9 cm.
Solution:

Given base b = 14 cm ; Height h = 9 cm
Area of the rhombus = b × h sq. units
= 14 × 9 cm² = 126 cm²

Question 3.
Find the missing value.

Solution:
(i) Given diagonal d₁ = 19 cm ; d₂ = 16 cm
Area of the rhombus = \(\frac{1}{2}\)(d₁ × d₂) sq. units = \(\frac{1}{2}\) × 19 × 16
= 152 cm²

(ii) Given diagonal d₁ = 26 m ; Area of the rhombus = 468 sq. m
= \(\frac{1}{2}\)(d₁ × d₂) = 468 ; (26 × d₂) = 468 × 2
d₂ = \(\frac{468 \times 2}{26}\) = d₂ = 36 m

(iii) Given diagonal d₂ = 12 mm; Area of the rhombus = 180 sq. m
\(\frac{1}{2}\)(d₁ × d₂) = 180
\(\frac{1}{2}\)(d₁ × 12) = 180
d₁ × 12 = 180 × 2
d₁ = \(\frac{180 \times 2}{12}\)
d₁ = 30 mm
Diagonal d₁ = 30 mm
Tabulating the results we have

Question 4.
The area of a rhombus is 100 sq. cm and length of one of its diagonals is 8 cm. Find the length of the other diagonal.
Solution:
Given the length of one diagonal d₁ = 8 cm ; Area of the rhombus = 100 sq. cm
\(\frac{1}{2}\)(d₁ × d₂) = 100
\(\frac{1}{2}\) × 8 × d₂ = 100
8 × d₂ = 100 × 2
d₂ = \(\frac{100 \times 2}{8}\) = 25 cm
Length of the other diagonal d₂ = 25 cm

Question 5.
A sweet is in the shape of rhombus whose diagonals are given as 4 cm and 5 cm. The surface of the sweet should be covered by an aluminum foil. Find the cost of aluminum foil used for 400 such sweets at the rate of ₹ 7 per 100 sq. cm.
Solution:
Diagonals d₁ = 4 cm and d₂ = 5 cm
Area of one rhombus shaped sweet = \(\frac{1}{2}\)(d₁ × d₂) sq. units = \(\frac{1}{2}\) × 4× 5 cm² = 10 cm²
Aluminum foil used to cover 1 sweet = 10 cm²
∴ Aluminum foil used to cover 400 sweets = 400 × 10 = 4000 cm²
Cost of aluminum foil for 100 cm² = ₹ 7
∴ Cost of aluminum foil for 4000 cm² = \(\frac{4000}{100}\) × 7 = ₹ 280
∴ Cost of aluminum foil used = ₹ 280.

Objective Type Questions

Question 6.
The area of the rhombus with side 4 cm and height 3 cm is
(i) 7 sq. cm
(ii) 24 sq. cm
(iii) 12 sq. cm
(iv) 10 sq. cm
Solution:
(iii) 12 sq. cm
Hint:
Area = Base × Height = 4 × 3 = 12 cm²

Question 7.
The area of the rhombus when both diagonals measuring 8 cm is
(i) 64 sq. cm
(ii) 32 sq. cm
(iii) 30 sq. cm
(iv) 16 sq. cm
Solution:
(ii) 32 sq. cm
Hint:
Area = \(\frac{1}{2}\)(d₁ × d₂) = \(\frac{1}{2}\) × 8 × 8 = 32

Question 8.
The area of the rhombus is 128 sq. cm. and the length of one diagonal is 32 cm. The length of the other diagonal is
(i) 12 cm
(ii) 8 cm
(iii) 4 cm
(iv) 20 cm
Solution:
(ii) 8 cm
Hint:
\(\frac{1}{2}\) × d₁ × d₂ = 128 ⇒ d₂ = \(\frac{128 \times 2}{32}\) = 8cm

Question 9.
The height of the rhombus whose area 96 sq. m and side 24 m is
(i) 8 m
(ii) 10 m
(iii) 2 m
(iv) 4 m
Solution:
(iv) 4 m
Hint:
Area = Base × height = 96 ⇒ height = \(\frac{96}{24}\) = 4

Question 10.
The angle between the diagonals of a rhombus is
(i) 120°
(ii) 180°
(iii) 90°
(iv) 100°
Solution:
(iii) 90°
Hint:
Angles of a rhombus bisect at right angles.

Samacheer Kalvi 7th Maths Solutions Term 1 Chapter 2 Measurements Ex 2.2 Read More »

Samacheer Kalvi 7th Maths Solutions Term 3 Chapter 5 Statistics Ex 5.4

Tamilnadu Samacheer Kalvi 7th Maths Solutions Term 3 Chapter 5 Statistics Ex 5.4

Miscellaneous Practice problems

Question 1.
Arithmetic mean of 15 observations was calculated as 85. In doing so an observation was wrongly taken as 73 for 28. What would be correct mean?
Solution:

85 × 15 = sum of 15 observations
1275 = sum of 15 observations
Wrong observation = 73
Correct observation = 28

Correct mean = 82

Question 2.
The median of 25,16,15,10, 8, 30.
Solution:
Arranging is ascending order : 8, 10, 15, 16, 25, 30
Here n = 6, even

∴ Median = 15.5

Question 3.
Find the mode of 2, 5, 5, 1, 3, 2, 2, 1, 3, 5, 3.
Solution:
Arranging the data in ascending order: 1, 1, 2, 2, 2, 3, 3, 3, 5, 5, 5
Here 2, 3 and 5 occurs 3 times each.
Which is the maximum number of times.
∴ Mode is 2, 3 and 5.

Question 4.
The marks scored by the students in social test out of 20 marks are as follows.
12, 10, 8, 18, 14, 16. Find the mean and the median?
Solution:
Arranging the given data in ascending order: 8, 10, 12, 14, 16, 18.

There are n = 6 observations, which is even

Question 5.
The number of goals scored by a football team is given below.
Find the mode and median for the data of 2 ,3, 2, 4, 6, 1, 3, 2, 4, 1, 6.
Solution:
Arranging the given data in ascending order: 1, 1, 2, 2, 2, 3, 3, 4, 4, 6, 6
Clearly 2 occurs at the maximum of 3 times and so mode = 2
Here number of data of data n = 11, odd.
∴ Median = (\(\frac { n+1 }{ 2 } \))^th term
= (\(\frac { 11+1 }{ 2 } \))^th
term = (\(\frac { 12 }{ 2 } \))^th term
= 6^th term
Median = 3

Question 6.
Find the mean and mode of 6, 11, 13, 12, 4, 2.
Answer:
Arranging is ascending order : 2, 4, 6, 11, 12, 13

Mean = \(\frac { 48 }{ 6 } \) = 8
All observation occurs only once and so there is no mode for this date.

Challenge Problems

Question 1.
The average marks of six students is 8. One more student mark is added and the mean is still 8. Find the student mark that has been added.
Solution:

Sum of observation = 6 × 8 = 48
If one more mark is added then number of observations = 6 + 1 = 7
Let the number be x
Still average = 8
∴ 8 = \(\frac { 48+x }{ 7 } \)
48 + x = 7 × 8
48 + x = 56
48 + x = 56 – 48
x = 8
∴ The number that is added = 8

Question 2.
Calculate the mean, mode and median for the following data: 22, 15, 10, 10, 24, 21.
Solution:
Arranging in ascending order: 10, 10, 15, 21, 22, 24

Here n = 6, even

∴ Median = 18
Clearly the data 10 occurs maximum number of times and so 10 is the mode.
∴ Mode = 10

Question 3.
Find the median of the given data: 14, -3, 0, -2, -8, 13, -1, 7.
Solution:
Arranging the data is ascending order: -8, -3, -2, -1, 0, 7, 13, 14
Here number of data n = 8, even
∴ Median

∴ Median = – 0.5

Question 4.
Find the mean of first 10 prime numbers and first 10 composite numbers.
Solution:
First 10 prime numbers are 2, 3, 5, 7, 11, 13, 17, 19, 23, 29

Mean = 12.9
Mean of first 10 prime numbers = 12.9
First 10 composite numbers are 4, 6, 8, 9, 10, 12, 14, 15, 16, 18

Mean of first 10 composite numbers = 11.2

Samacheer Kalvi 7th Maths Solutions Term 3 Chapter 5 Statistics Ex 5.4 Read More »

Samacheer Kalvi 7th Maths Solutions Term 3 Chapter 4 Geometry Ex 4.2

Tamilnadu Samacheer Kalvi 7th Maths Solutions Term 3 Chapter 4 Geometry Ex 4.2

Question 1.
Draw circles for the following measurements of radius (r)/ diameters(d).
(i) r = 4 cm
(ii) d = 12 cm
(iii) r = 3.5 cm
(iv) r = 6.5 cm.
(v) d = 6 cm
Solution:
(i) r = 4 cm

Step 1 : Market a point ‘O’ on the paper.
Step 2 : Extended the compass distance equal to radius 4 cm.
Step 3 : At center ‘O’, helded the compass firmly and placed the pointed end of the compass.
Step 4 : Slowly rotated the compass around to get the circle.

(ii) d = 12 cm
given d= 12 cm
∴ radius r = \(\frac { d }{ 2 } \) = \(\frac { 12 }{ 2 } \) = 6 cm

Step 1: Marked a point ‘O’ on the paper.
Step 2: Extended the compass distance equal to radius 6 cm.
Step 3: At center ‘O’, held the compass firmly and placed the pointed end of the compass.
Step 4: Slowly rotated the compass around to get the circle.

(iii) r = 3.5 cm

Step 1: Market a point ‘O’ on the paper.
Step 2: Extended the compass distance equal to radius 3.5 cm.
Step 3: At center ‘O’, held the compass firmly and placed the pointed end of the compass.
Step 4: Slowly rotated the compass around to get the circle.

(iv) r = 6.5 cm

Step 1: Market a point ‘O’ on the paper.
Step 2: Extended the compass distance equal to radius 6.5 cm.
Step 3: At center ‘O’, held the compass firmly and placed the pointed end of the compass.
Step 4: Slowly rotated the compass around to get the circle.

(v) d = 6 cm
∴ radius r = \(\frac { d }{ 2 } \) = \(\frac { 6 }{ 2 } \) = 3 cm

Step 1: Market a point ‘O’ on the paper.
Step 2: Extended the compass distance equal to radius 3 cm.
Step 3: At center ‘O’, held the compass firmly and placed the pointed end of the compass.
Step 4: Slowly rotated the compass around to get the circle.

Question 2.
Draw concentric circles for the following measurements of radii / diameters. Find out the width of each circular ring.
(i) r = 3 cm and r = 5 cm.
(ii) r = 3.5 cm and r = 6.5 cm.
(iii) d = 6.4 cm and d = 11.6 cm.
(iv) r = 5 cm and r = 7.5 cm.
(vi) r = 7.1 cm and d = 12 cm.
Solution:
(i) r = 3 cm and r = 5 cm.

Width of the circular ring = OB – OA = 5 – 3 = 2 cm
Step 1: Drawn a rough diagram and market the given measurements
Step2: Taken any point O and marked it as center.
Step 3: With O as center drawn a circle of radius OA = 3 cm.
Step 4: With O as center drawn a circle of radius OB = 5 cm. Thus concentric circles C₁ and C₂ are drawn.
Width of the circular ring = OB – OA = 5 – 3 = 2 cm

(ii) r = 3.5 cm and r = 6.5 cm

Step 1: Drawn a rough diagram and market the given measurements
Step 2: Taken any point O and marked it as the center.
Step 3: With O as center drawn a circle of radius OA = 3.5 cm.
Step 4: With O as center drawn a circle of radius OB = 6.5 cm. Thus the concentric circles C₁ and C₂ are drawn.
Width of the circular ring = OB – OA = 6.5 – 3.5 = 3 cm

(iii) d = 6.4 cm and d = 11.6 cm
r = \(\frac { d }{ 2 } \)
r = \(\frac { 6.4 }{ 2 } \) = 3.2 cm; r = \(\frac { 11.6 }{ 2 } \) = 5.8 cm

Step 1: Drawn a rough diagram and market the given measurements
Step 2: Taken any point O and marked it as the center.
Step 3: With O as center drawn a circle of radius OA =3.2 cm.
Step 4: With O as center and drawn a circle of radius OB = 5.8 cm. Thus the concentric circles C₁ and C₂ are drawn.

Width of the circular ring = OB – OA = 5.8 – 3.2 = 2.6 cm

(iv) r = 5 cm and r = 7.5 cm

Step 1 : Drawn a rough diagram and market the given measurements
Step 2 : Taken any point O and marked it as the center.
Step 3 : With O as center drawn a circle of radius OA = 5 cm.
Step 4 : With O as center drawn a circle of radius OB = 7.5 cm. Thus the concentric circles C₁ and C₂ are drawn.
Width of the circular ring = OB – OA = 7.5 – 5 = 2.5 cm

(v) d = 6.2 cm and r = 6.2 cm.
r = \(\frac { d }{ 2 } \)
∴ r = \(\frac { 6.2 }{ 2 } \) = 3.1 cm and r = 6.2 cm

Step 1: Drawn a rough diagram and market the given measurements
Step 2: Taken any point O and marked it as the center.
Step 3: With O as center, drawn a circle of radius OA = 3.1 cm.
Step 4: With O as center, drawn a circle of radius OB = 6.2 cm.
Thus the concentric circles C₁ and C₂ are drawn.
Width of the circular ring = OB – OA = 6.2 – 3.1 = 3.1 cm

(vi) r = 7.1 cm and d = 12 cm.
r = \(\frac { d }{ 2 } \)
∴ r = \(\frac { 12 }{ 2 } \) = 6 cm and r = 7.1 cm

Step 1: Drawn a rough diagram and marked the given measurements
Step 2 : Taken any point O and marked it as center.
Step 3 : With O as center, drawn a circle of radius OA = 6 cm.
Step 4 : with O as center, drawn a circle of radius OB = 7.1 cm. Thus concentric circles
C₁ and C₂ are drawn.
Width of the circular ring = OB – OA = 7.1 – 6 = 1.1 cm

Samacheer Kalvi 7th Maths Solutions Term 3 Chapter 4 Geometry Ex 4.2 Read More »

Samacheer Kalvi 7th Maths Solutions Term 3 Chapter 4 Geometry Intext Questions

Tamilnadu Samacheer Kalvi 7th Maths Solutions Term 3 Chapter 4 Geometry Intext Questions

Exercise 4.1
Try These (Text book Page No. 72)

Question 1.
Can you draw a shape which has no line of symmetry?
Solution:
Yes

Question 2.
Draw all possible line of symmetry for the following shapes.
Solution:

Think (Text book Page No. 73)

Question 1.
What can you say about the number of lines of symmetry of a circle?
Solution:
A circle has infinite number of lines of symmetry.

Try These (Text book Page No. 73)

Question 1.
Reflect the words CHEEK, BIKE, BOX with horizontal line.
Solution:

Question 2.
Reflect the following words with vertical line.

Solution:

Think (Textbook Page no.73)

Question 1.
Will the figure be symmetric about both the diagonals?
Solution:
Yes, it is symmetric about both the diagonals.

Try These (Text book Page No. 74)

Question 1.
Find the order of rotational symmetry of the following figures.

Solution:
Order of symmetry : 6
Order of symmetry : 3

Question 2.
Find the order of rotational symmetry for an equilateral triangle.
Solution:

For an equilateral triangle order of rotational symmetry is 3.

Think (Text book Page No. 74)

Question 1.
Can a parallelogram have a rotational symmetry?
Solution:

Yes, order of rotational symmetry is 2.

Try These (Text book Page No. 75)

Question 1.
Using translational symmetry make new pattern with the given figure.

Solution:

Try These (Text book Page No. 77)

Question 1.
Translate this figure to 4 → 3↑

Solution:

Question 2.
Translate this figure to 2 ↓ 1 ←

Solution:

Question 3.
How is the pre-image A translated to image A’ in each of the following figures?
(i)

(ii)

Solution:
(i) 8 →

(ii) 5 → 3 ↑

Think (Text book Page No. 78)

Question 1.
The pre-image and the image after a translation coincide. What can you say about the translation
Solution:
There is no right, left, up or down movement took place.

Try These (Text book Page No. 80)

Question 1.
Draw the line reflection in the following pictures.

Solution:

Question 2.
Reflect the shape with given line of reflection.

Solution:

Samacheer Kalvi 7th Maths Solutions Term 3 Chapter 4 Geometry Intext Questions Read More »