Question

The angle of depression from the top of a light-house

D h cotA - cotB Here h height of light house D AB 60 60 h cot30 - cot60 60 h 3-13 60 h 3-13 2h3 60 m h 60 32 303 m So height of the tower is 303 m

of two boats are 60° and 30° towards the west, if the two boats are 60m apart, then the height of the light house is

A 20√2 m

B 30√3 m

C 40√3 m

D 50√3 m

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