Q1 of 113 Page 128

The angles between North and West and South and East are

The angle between North and West is 90^° and between South and East is also 90^°.

So the sum of this two angles is equal to 180^° and hence they are supplementary angles.

Angles between South and West and South and East are

In Fig. 5.9, PQ is a mirror, AB is the incident ray and BC is the reflected ray. If ∠ABC = 46°, then ∠ABP is equal to

If the complement of an angle is 79°, then the angle will be of

Angles which are both supplementary and vertically opposite are