Find the distance from the eye at which a coin of 2 cm diameter should be held so as to conceal the full moon whose angular diameter is 31'.

Find the distance from the eye at which a coin must be placed so as just to hide the full moon.The diameter of coin being 2 cm and the diamter of the moon makes an angle 31'at the eye of the observer.

Find area of circle whose diameter is 14cm.

Find area of circle whose diameter is 14 cm.

Find area of circle whose diameter is 14 cm.

Find the area of circle whose diameter is 21 cm