Question

How do you find the circumference and area of a circle with diameter of 9 inches?

Answer 1

Diameter = 9 inches
Radius = r = diameter /2 = 4.5 inches

For Circumference:

`C = 2.pi.r`
`C = 2 . 3.142 . 4.5`
`C = 28.278` inches

For Area:

`A = pi.r^2`
`A = 3.142 . (4.5)^2`
`A = 63.62` Sq.Inches