AC and BD are two perpendicular diameter of a circle ABCD. Given that the area of shaded portion 308 cm2 calculate :
Answers:
(i) Let r be the radius of the circle.
Then
½ πr2 = 308
½ × 22/7 × r2 = 308
r2 = 308 × 2 × 7/22
r2 = 196
r = 14 cm
Now , AC = 2r = 28 cm
(ii) Circumference = 2πr
= 2 × 22/7 × 28
= 88 cm.