Question

If the radius of a circle is 9 cm what is the area and circumference?

Answer 1

Area: `81\pi`
Circumference: `18pi`

Explanation:

You just need to use the formulas:

Area = `r^2 * \pi = 9^2 * \pi = 81 * \pi`
Circumference = `2*r*\pi = 2*9*pi = 18*\pi`