boy is standing at some distance from a 30 m tall building and his eye level from the ground is 1.5 m. 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.
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Answer:
Step-by-step explanation:
Ac/BD= tan 30
28.5/BD=1/root 3
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Ac/DC=tan 60
28.5/DC= root 3
28.5/root 3= DC
We know that
BC=DC+BD
28.5/root 3 + 28.5 root 3 = BC
BC= 57/root 3
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Rationalize
57/root 3 *root 3/root 3
=19 root 3
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I hope this will help you
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kitkat57:
thnk u so much...
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