A tower is 20 m high

MATHEMATICS · Single correct · CBSE · Mathematics · Applications of Trigonometry · Applications of Trigonometry

Problem

A tower is 20 m high. From a point P on level ground, the angle of elevation of its top is 45°. If

d

metres is the horizontal distance of P from the base of the tower, which one of the following equations will give the value of

d

? (a)

\sin 45^{\circ}=\dfrac{20}{d}

(b)

\cos 45^{\circ}=\dfrac{20}{d}

(c)

\tan 45^{\circ}=\dfrac{20}{d}

(d)

\tan 45^{\circ}=\dfrac{d}{20}