Question

the radius of the inner circle of a washer is 3 cm the outer radius of the shaded region between the inner circle and the outer circle is 2 cm find the area of the shaded region

Answer 1

Answer:

Step-by-step explanation:

To get the area of the shaded region we need to get the difference between the area of the inner circle and the outer circle.

Area of the inner circle :

Area = 22/7 × r × r

r = 3 cm

The area is thus :

22/7 × 3 × 3 = 28.29 square centimeters.

The area of the outer circle is thus :

Radius = 3 + 2 = 5 cm

The area is therefore :

22/7 × 5 × 5 = 78.57 square centimeters.

The shaded region is equal to :

78.57 - 28.29 = 50.28 square centimeters.

The area of the shaded region is therefore :

= 50.28 square centimeters.