Posted by **jenna** on Sunday, July 3, 2011 at 11:25am.

what is the exact circumference of a circle with a diameter of 13 inches?

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**bobpursley**, Sunday, July 3, 2011 at 12:33pm
what is the formula PI*diameter=Cicumference used for?

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**jenna**, Sunday, July 3, 2011 at 12:36pm
i am confused??

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**jenna**, Sunday, July 3, 2011 at 12:40pm
the pi is 3.14

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**bobpursley**, Sunday, July 3, 2011 at 1:06pm
C=PI*diameter.

You need to get this down.

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**jenna**, Sunday, July 3, 2011 at 1:38pm
okay but the options i have to choose from are:

a. 26Pi in.

b. 6.5Pi in.

c. 13Pi in.

d. 42.25Pi in.

e. 169Pi in.

i think it's a. right?

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