An observer at point A on level ground finds the angle of elevation of the top of a…
MATHEMATICS · Subjective · CBSE · Mathematics · Applications of Trigonometry · Applications of Trigonometry
Problem
An observer at point A on level ground finds the angle of elevation of the top of a vertical mast to be 30∘. He then walks 20 m straight towards the mast to point B, where the angle of elevation becomes 45∘. Determine
(i) the height of the mast, and
(ii) the original distance of point A from the foot of the mast.