RS Aggarwal Class 6 Math Twentieth Chapter Two-Dimensional Reflection Symmetry (linear Symmetry) Exercise 20 Solution

EXERCISE 20

LINEAR SYMMETRY – A figure is said to be symmetrical about a line l, if it is identical on either side of l.

Mark (√) against the correct answer in each of Q.1 to Q.8.

(1) A square has

Ans: (d) four lines of symmetry

(2) A rectangle is symmetrical about

Ans: (c) a line

(3) A rhombus is symmetrical about

Ans: (b) each of its diagonals

(4) A circle has

Ans: (d) an unlimited number of lines of symmetry

(5) A scalene triangle has

Ans: (a) no line of symmetry

(6) ABCD is a kite in which AB = AD and BC = DC.
The kite is symmetrical about

Ans: (a) the diagonal AC

(7) The letter O of the English alphabet has

Ans: (c) two lines of symmetry

(8) The letter Z of the English alphabet has

Ans: (a) no line of symmetry

(9) Draw the line (or lines) of symmetry of each of the following figures.

(10) Which of the following statements are true and which are false?

(i) A parallelogram has no line of symmetry. = True

(ii) An angle with equal arms has its bisector as the line of symmetry. = True

(iii) An equilateral triangle has three lines of symmetry. = True

(iv) A rhombus has four lines of symmetry. = False

(v) A square has four lines of symmetry. = True

(vi) A rectangle has four lines of symmetry. = True

(vii) Each one of the letters H, I, O, X of the English alphabet has two lines of symmetry. = True