Question

In the figure, if ACB is the arc of circle having O as the centre and OA as the O, radius. Then find the area of the shaded portion

Answer 1

Radius of the sector = 8cm Central angle = 90°

OBA is a right angled triangle

∴ Area of ΔOBA = 1/2 × 8 × 8 = 32 cm²

Area of shaded portion = 50.24 – 32 = 18.32 cm²