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Chapter assessment
A. Choose the correct option.
1. A square has a rotational symmetry of order

(a) 1 (b) 2 (c) 3 (d) 4
2. The letter S has a rotational symmetry of order

(a) 1 (b) 2 (c) 3 (d) 4
3. The angle of rotation of a figure is 36°, its order of rotational symmetry is
(a) 4 (b) 6 (c) 9 (d) 10
4. Which of the following letters has no line of symmetry?
(a) B (b) A (c) Z (d) M
5. In the word “MATHS” which of the following pairs of letters shows rotational symmetry
(a) M and T (b) H and S (c) A and S (d) T and S

B. Assertion and Reason Type Questions.
In the following questions, a statement of Assertion (A) is followed by a statement of Reason (R).
Choose the correct option as:

(a) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A).
(b) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of
Assertion (A).
(c) Assertion (A) is true but Reason (R) is false.
(d) Assertion (A) is false but Reason (R) is true.

1. Assertion (A): Square has four lines of symmetry.
Reason (R): The line of symmetry is a line that divides an object into two identical pieces.
2. Assertion (A): The order of rotational symmetry is 5, and the angle of rotation is 72°.

Reason (R): The number of times a figure fits onto itself in a complete rotation is called the order
of rotational symmetry. If the angle of rotation of an object is x°, then the order of
360°
rotational symmetry is given by .
° x
3. Assertion (A): The letter H has 2 lines of symmetry and order of rotational symmetry 2.
Reason (R): Letter H has an angle of rotational symmetry 180°.

C. Complete the given table.

Figure Lines of Number of Lines Rotational Order of Rotational
Symmetry of Symmetry Symmetry Symmetry

Parallelogram

Semi-circle
Trapezium

Isosceles triangle

Regular octagon

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