Question

A circle with radius of 9 cm sits inside a circle with radius of 11 cm what is the area of the shaded region

Answer 1

π(11²-9²)

3.14 ×(121-81)

30×3.14

94.2 cm²

Answer 2

Answer:

The area of shaded region is 125.66 square cm.

Step-by-step explanation:

Here we are given two circle one inside the other.

Radius of one circle is 11 cm and radius of another circle is 9 cm.

Area of shaded region =  Area of larger circle - Area of smaller circle

Area of shaded region $=\pi 11^2-\pi 9^2$

Area of shaded region $=\pi(11^2 - 9^2)$

Area of shaded region $=\pi(121-81)$

Area of shaded region $=40\pi\approx 125.66\text{ cm}^2$

Hence, The area of shaded region is 125.66 square cm.