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     EduGorilla 
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    A round balloon of radius r subtends an angle α at the eye of an observer while the angle of elevation of its center is β. The height of the center of the balloon is:

    Options :-

    1. r sinβ. cosecα/2

    2. r cos β. Cosec α/2

    3. r2 sin β/2. cos α/2. sin β

    4. r2 sin β/2. cos α/2

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