Question

4. A helicopter is in a stationary position at a certain height
over the lake. At a point 200 m above the surface of the
lake, the angle of elevation of the helicopter is 45°. At the
same time, the angle of depression of its reflection in the
lake is 75°. Calculate the height of the helicopter from
the surface of the lake :
200/root3
(a)
(b) 200×root3
(c) 200 m
(d) 150 m
ans- b
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Answer 1

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