What Is The Circumference Of A Circle That Has A 9 Inch Diameter?

28.26 inches

The perimeter of the circle is called circumference of the circle. Circumference of the circle is equal to the twice of pi time radius of circle.

Circumference = 2*pi*R

Radius = Diameter/2

Radius = 9 inches/ 2

radius = 4.5 inches

Circumference = 2*pi * 4.5 inches

Circumference = 2*3.14 * 4.5 inches

Circumference = 28.26 inches

Circumference = PI times the diameter. Use the PI button on your calculator or try 3.14 x 9. The answer is 28.29inches square :)