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A person was standing on a road near a mall. He was 1215 m away from the mall and able to see the top of the mall from the road in such a ways that the top of a tree, which is in between him and the mall, was exactly in line of sight with the top of the mall. The tree height is 20 m and it is 60 m away from him. How tall (in m) is the mall?
Answer & Solution
Correct Answer:
Option
C
$$\eqalign{ & \tan \theta = \frac{{20}}{{60}} = \frac{1}{3} \cr & {\text{Now }}\tan \theta = \frac{h}{{1215}} \cr & \frac{1}{3} = \frac{h}{{1215}} \cr & h = 405 \cr} $$
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