## RS Aggarwal Class 7 Math Eighteenth Chapter Reflection and Rotational Symmetry Exercise 18A Solution

## EXERCISE 18A

#### Tick (√) the correct answer in each of Q. (1) to Q. (9).

**(1) A scalene triangle has **

Ans: (a) no line of symmetry.

**(2) A rectangle is symmetrical about **

Ans: (c) a line joining the midpoints of its opposite sides.

**(3) A square has**

Ans: (d) four lines of symmetry.

**(4) A rhombus is symmetrical about**

Ans: (b) each of its diagonals.

**(5) A circle has**

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

**(6) In ∆ABC, AB = AC and AD ****⊥**** BC, BE ****⊥ AC and CF ⊥ AB. Then, ****∆ABC is symmetrical about**

Ans: (a) AD

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

Ans: (a) the diagonal AC.

**(8) The letter O of the English alphabet has**

Ans: (c) two lines of symmetry.

**(9) The letter Z of the English alphabet has**

Ans: (a) no line of symmetry.

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

**(11) Which of the following statements are true and which of them 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 two lines of symmetry. = **True**

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

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