Question

In the figure, OA is a diameter of the smaller circle and O is the centre of the larger circle. Find the

area of the shaded region.

Answer 1

942 6/7 cm²

Explanation:

Since O = Center of bigger circle, OA = Radius of bigger circle.

∴ Area of smaller circle - Area of bigger circle = Area of shaded part.

∴ Area of smaller circle = 22/7 × 10²

= 22/7 × 100

= 2200/7

= 314 2/7 cm²

∴ Area of bigger circle = 22/7 × 20 ²

= 22/7 × 400

= 1257 1/7 cm²

∴ Area of shaded part = 1257 1/7 - 314 2/7

= 942 6/7 cm²