Diagram First!!!

Geometry Level 2

A round balloon of radius r subtends an angle alpha at the eye of an observer while the angle of elevation of its centre is beta. Find the height of the centre of the balloon.

(The crux of the problem is to draw the diagram)

Note : Consider the eye to be a point

r tan beta cos (alpha/2) r cos beta sec (alpha/2) r sin beta cosec (alpha/2) r cot beta sec (alpha /2)

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