Ac And Bd Are Two Perpendicular Diameter Of Circle Abcd

AC and BD are two perpendicular diameter of a circle ABCD. Given that the area of shaded portion 308 cm2 calculate :

(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.