A spherical ball of diameter d subtends an angle `alpha` at a man's eye when the elevation of its centre is `beta`, then the height of the centre of the ball is `1/2d sin beta cosec(alpha/2)`.

A spherical balloon of radius 50 cm, subtends an angle of 60^(@) at a man's eye when the elevation of its centre if 45^(@) . Then the height of the centre of the ballon is

A spherical baloon of radius 50 cm, subtends an angle of 60^(@) at a man's eye when the evevatin of its centre is 45^(@). Then the height of the centre of the balloon is

A sperical balloon of radius r subtends an angle alpha at the eye of an observer, while the angle of elevation of its centre is beta . The height of the centre of the ballon is

A round balloon of radius r subtends an angle alpha at the eye of the observer while the angle of elevation of its centre is beta Prove that the height of the centre of the balloon is r sin beta cos ec[(alpha)/(2)]

A round balloon of radius r subtends an angle alpha at the eye of the observer while the angle of elevation of its centre is beta. Prove that the height of the centre of the balloon is r sin(beta)cos ec(alpha)/(2)

A round balloon of radius r subtends an angle at the eye of the observer while the angle of elevation of its centre is beta. Prove that the height of the centre of the balloon is r sin beta csc(alpha)/(2)

A round balloon of radius r subtends an angle a at the eye of the observer while the angle of elevation of its centre is p. Prove that the height of the centre of the balloon B is r sin beta cosec (alpha)/(2) .

A round balloon of radius R subtend an angle 2alpha at the eye of the observer, while the angle of elevation of it's centre is 2beta , then the height of the centre of balloon is