If the angle of elevation of a cloud from a period 10 m . above a lake is 30 and the angle of depression of its suflection in the lake is 60 .find the height of the cloud from the surface of lake .
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If the angle of elevation of a cloud from point h metres above a lake is α and the angle of depression of its reflection in the lake is β, prove that the distance of the cloud from the point of observation is
tanβ−tanα
2hsecα
.
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