At a point on level ground the angle of elevation of the top of a tower is

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

Problem

At a point

A

on level ground the angle of elevation of the top of a tower is

45^{\circ}

. After walking

30\,\text{m}

straight towards the tower to point

B

, the angle becomes

60^{\circ}

. Calculate the height of the tower (nearest tenth). (a)

41.0\,\text{m}

(b)

71.0\,\text{m}

(c)

50.0\,\text{m}

(d)

81.0\,\text{m}