Lines and Angles Test

Result

Lines and Angles Test - 1

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Weekly Quiz Competition

Question 1
1 / -0

Which of the following angles is obtuse?

A
∠A = 30°

B
∠B = 60°

C
∠P = 90°

D
∠R = 92°

Solution

An obtuse angle is always greater than 90^o and less than 180^o.
Also, 92^o > 90^o.

So, ∠R = 92^o is an obtuse angle.
Question 2
1 / -0

Which of the following pairs of angles is complementary?

A
45^o, 40^o

B
60^o, 120^o

C
21^o, 79^o

D
23^o, 67^o

Solution

Two angles are called complementary angles, if their sum is 90⁰.

Since 23⁰ + 67⁰ = 90⁰ so, 23⁰, 67⁰ is a pair of complementary angles.
Question 3
1 / -0

Which of the following angles are supplementary?

A
60°, 30°

B
110°, 75°

C
120°, 37°

D
120°, 60°

Solution

Two angles are called supplementary angles if their sum is 180°.
As 60° + 120° = 180°

So, 120°, 60° is a pair of supplementary angles.