RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev

RD Sharma Solutions for Class 7 Mathematics

Created by: Abhishek Kapoor

Class 7 : RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev

The document RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev is a part of the Class 7 Course RD Sharma Solutions for Class 7 Mathematics.
All you need of Class 7 at this link: Class 7

Question 1:

State the number of lines of symmetry for the following figures:
 (i) An equilateral triangle
 (ii) An isosceles triangle
 (iii) A scalene triangle
 (iv) A rectangle
 (v) A rhombus
 (vi) A square
 (vii) A parallelogram
 (viii) A quadrilateral
 (ix) A regular pentagon
 (x) A regular hexagon
 (xi) A circle
 (xii) A semicircle

Answer 1:

(i) An equilateral triangle has 3 lines of symmetry.
(ii) An isosceles triangle has 1 line of symmetry.
(iii) A scalene triangle has no line of symmetry.
(iv) A rectangle has 2 lines of symmetry.
(v) A rhombus has 2 lines of symmetry.
(vi) A square has 4 lines of symmetry.
(vii) A parallelogram has no line of symmetry.
(viii) A quadrilateral has no line of symmetry.
(ix) A regular pentagon has 5 lines of symmetry.
(x) A regular hexagon has 6 lines of symmetry.
(xi) A circle has an infinite number of lines of symmetry all along the diameters.
(xii) A semicircle has only one line of symmetry.

 

Question 2:

What other name can you give to the line of symmetry of
 (i) An isosceles triangle?
 (ii) A circle?

Answer 2:

(i) An isosceles triangle has only 1 line of symmetry.

RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev

 This line of symmetry is also known as the altitude of an isosceles triangle.

(ii) A circle has an infinite number of lines of symmetry all along its diameters.

RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev

 

Question 3:

Identify three examples of shapes with no line of symmetry.

Answer 3:

A scalene triangle, a parallelogram and a trapezium do not have any line of symmetry.

RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev    RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev     RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev

 

 

Question 4:

Identify multiple lines of symmetry, if any, in each of the following figures:

RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev   RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev

RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev   RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev

Answer 4:

(A) The given figure has 3 lines of symmetry. Therefore it has multiple lines of symmetry.

RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev

(B) The given figure has 2 lines of symmetry. Therefore it has multiple lines of symmetry.

RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev

(C) The given figure has 3 lines of symmetry. Therefore it has multiple lines of symmetry.

RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev

(D) The given figure has 2 lines of symmetry. Therefore it has multiple lines of symmetry.

RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev

(E) The given figure has 4 lines of symmetry. Therefore it has multiple lines of symmetry.

RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev

(F) The given figure has only 1 line of symmetry.

RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev

(G) The given figure has 4 lines of symmetry. Therefore it has multiple lines of symmetry.

RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev

(H) The given figure has 6 lines of symmetry. Therefore it has multiple lines of symmetry.

RD Sharma Solutions - Ex-18.1, Symmetry, Class 7, Math Class 7 Notes | EduRev

Complete Syllabus of Class 7

Dynamic Test

Content Category

Related Searches

RD Sharma Solutions - Ex-18.1

,

ppt

,

Class 7

,

Sample Paper

,

Symmetry

,

Summary

,

mock tests for examination

,

Math Class 7 Notes | EduRev

,

Symmetry

,

pdf

,

Math Class 7 Notes | EduRev

,

Extra Questions

,

Exam

,

video lectures

,

Class 7

,

shortcuts and tricks

,

Symmetry

,

Important questions

,

Previous Year Questions with Solutions

,

MCQs

,

Objective type Questions

,

RD Sharma Solutions - Ex-18.1

,

RD Sharma Solutions - Ex-18.1

,

Math Class 7 Notes | EduRev

,

past year papers

,

Class 7

,

study material

,

Semester Notes

,

Free

,

practice quizzes

,

Viva Questions

;