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Chapter assessment
A. Choose the correct options.
1. Twice of an angle is equal to thrice of its supplement. The angle is

(a) 54° (b) 108° (c) 216° (d) 178°
2. Supplement of an angle is equal to thrice of its complement. The angle is
(a) 15° (b) 30° (c) 45° (d) 55°
3. If an angle is 60° less than two times of its supplement, then the greater angle is
(a) 100° (b) 80° (c) 60° (d) 120°
4. In the given figure, line l intersects two parallel lines PQ and RS. Then, which l
one of the following is not true?
(a) ∠1 = ∠3 (b) ∠2 = ∠4 P 1 7 Q
(c) ∠6 = ∠7 (d) ∠4 = ∠8 8 2
B. Assertion and Reason Type Questions. R 3 5 S
6 4
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): The sum of the measures of two supplementary angles is 180°.
Reason (R): If A and B are two supplementary angles, then ∠A + ∠B = 180°.
2. Assertion (A): Parallel lines are always equidistant.
Reason (R): If two parallel lines are intersected by a transversal, then a pair of alternate angles are
equal.
3. Assertion (A): ∠A and ∠B are supplementary angles. ∠A = x + 10° and ∠B = x − 10°, then ∠A and
∠B are 100° and 80°.
Reason (R): The angles x − 10° and 190° – x are supplementary.

C. Match the Following.
Column A Column B
(a) Complementry angles (i) 180°
(b) Linear pair of angles (ii) 55°, 35°
(c) Supplement of 78° (iii) 90°

(d) Straight angle (iv) 141°, 39°
(e) Right angle (v) 102°
D. Fill in the blanks.
1. Two lines in a plane which never meet at any point are called ......................
2. Adjacent angles have a common vertex, a common ................. and no-common .............

3. The angles x and 90° – x are ........................
4. An angle which is half of its supplement is of ..........................
5. Sum of interior angles on the same side of a transversal is ..........................

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