Page 147 - New Medley 5 Semester 2

E. Draw any four shapes on the following dot paper. Colour right angle
red, acute angle blue and obtuse angle green. One is done for you.

Pair of Angles

Think about the following diagrams:
B

Given, ∠AOB is a right angle. C is any point in the interior

of ∠AOB, so the ray OC divides it in two angles ∠AOC and C
∠BOC.

O A
Therefore, ∠AOC + ∠BOC = 90° (= ∠AOB)

Thus, ∠AOC and ∠BOC form a pair of complementary angles. In other
words, if the sum of two angles is 90°, then the angles are said to be

complementary angles.
P
Here, ∠LMN is a straight angle, so ∠LMN = 180°.

Also, ray MP stands at point M on line LN. L M N

Therefore, ∠LMP + ∠NMP = 180°

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