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

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Brittney Pezzullo Profile
28.26 inches
amber Jhon Profile
amber Jhon answered
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
Anonymous Profile
Anonymous answered
Circumference = PI times the diameter. Use the PI button on your calculator or try 3.14 x 9. The answer is 28.29inches square :)
thanked the writer.
Anonymous
Anonymous commented
Not that I'm anal or anything but it blows my mind that people would use a button on a calculator for such a simple calculation. BTW, it's not 28.29 inches square, it is 28.26 inches (as in linear length, not area!) LOL throw away your calc!
:D =)
:D =) commented
Thanks!!! Have kind of this questions in my test... :)

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