Question

Find the area of the shaded region in the given concentric circles with diameter 30cm and 20cm. Use π=3.14.​

Answer 1

Answer:

area of circle is πr²

area of small circle is 3.14× 10

- 31.4m²

area of big circle is 3.14x15

- 47.1m²

area of shaded portion is - 47.1 - 31.4

- 15.7m²