Question : 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 way 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's height is 20 m and it is 60 m away from him. How tall (in m) is the mall?
Option 1: 300
Option 2: 375
Option 3: 405
Option 4: 250
Correct Answer: 405
Solution :
Let the height of the mall be AB.
In $\triangle DEC$,
$\tan\theta = \frac{DE}{CE}$
⇒ $\tan\theta = \frac{20}{60}$
⇒ $\tan\theta = \frac{1}{3}$
In $\triangle ABC$,
$\tan\theta = \frac{AB}{BC}$
⇒ $\frac{1}{3} = \frac{AB}{1215}$
⇒ AB = 405 m
Hence, the correct answer is 405.
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