Lance is making a poster for Bike Safety Week. The diameter of circle A is 18 in. If the area of circle B is 1/5 the area of circle A, what is the area of circle B?

Answer 1

First, we need to find the area of circle A using the formula A = πr^2, where r is the radius of the circle. Since the diameter of circle A is 18 inches, the radius is half of that, which is 9 inches.

A = π(9)^2
A = π(81)
A = 81π

Therefore, the area of circle A is 81π square inches.

Since the area of circle B is 1/5 the area of circle A, we can calculate it by dividing the area of circle A by 5.

Area of circle B = (1/5)(81π)
Area of circle B = 81π / 5
Area of circle B = 16.2π

Therefore, the area of circle B is 16.2π square inches.