Question 6:
A 1.5 m tall boy is standing at some distance from a 30 m tall building. The angle of elevation from his eyes to the top of the building increases from 30° to 60° as he walks towards the building. Find the distance he walked towards the building.
Answer:
Let the boy was standing at point S initially. He walked towards the building and reached at point T.
It can be observed that
PR = PQ − RQ
= (30 − 1.5) m = 28.5 m = 57/2 m
Hence, he walked 19√3 m towards the building.
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