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January 28, 2015

January 28, 2015

Posted by **Jen** on Friday, July 29, 2011 at 11:19pm.

Is it 110.25p inches??

- Math -
**Bosnian**, Saturday, July 30, 2011 at 1:57amIn google type:

circumference of a circle

When you see list of results go on wikipedia.

C = circumference

d = diameter

C = d*pi

C = 21*3.14159

C = 65.97339 in

- Math -
**Reiny**, Saturday, July 30, 2011 at 7:38amCircumference = 2πr or dπ with d as diameter

so circumference = 21π

(it asked for "exact" circumference , so the answer has to be left in terms of π )

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