Question

find the area of shaded portion 21 cm and 3.5 cm​

Answer 1

Answer:

Let the radius of smaller circle be r and bigger circle be R cm.

Radius of bigger circle = 21+3.5 cm

= 24.5 cm

So,

Area of smaller circle = $\pi$r²

= 3.14*21*21 cm²

= 1384.74 cm²

Area of bigger circle = $\pi$R²

= 3.14*24.5*24.5 cm²

= 1884.78 cm²

Area of shaded portion = 1884.78-1384.74 cm²

= 500.04 cm²

I hope this helps.