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Question

A person is standing on the bank of river observer that angle of elevation of the top of the tower standing on the opposite of bank is 60. When he moves 40m away from the bank he find the angle of elevation to be 30. Find the height of the tower at width of the river.

A
203m
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B
23m
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C
53m
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D
None of these
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Solution

The correct option is A 203m
REF.Image
tan60=lh ___ (i)
tan30=l40h ___ (ii)
(i)(ii) 3=ll40
3l120=l
2l=120
l=60
33=6040h
13=20h
h=203m
Height = 203

1068792_1181346_ans_800f19ab3d5144c4a7c0692944962e90.png

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