From a point 100 m above a lake the angle of elevation of a stationary helicopter is 30° and the angle of depression of reflection of the helicopter in the lake is 60°. Find the distance between the given point and the helicopter. (helicopter's distance from the lake is 200m)
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From a point 100 m above a lake the angle of elevation of a stationary helicopter is 30° and the angle of depression of reflection of the helicopter in the lake is 60°. Find the distance between the given point and the helicopter. (helicopter's distance from the lake is 200m)
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