Question

In the figure alongside, OAB is a quadrant of a circle. The radius OA = 3.5 cm and OD = 2 cm. Calculate the area of the shaded 22 portions.

Answer 1

Area of the shaded portion = Area of Quadrant - Area of Δ OAD

Area of the shaded portion = `1/4 π (3.5)^2 - 1/2 xx 3.5 xx 2`

Area of the shaded portion = `22/7 xx 1/4 xx 3.5 xx 3.5 - 3.5`

Area of the shaded portion = 6.125 cm²