Asked by jenna

what is the exact circumference of a circle with a diameter of 13 inches?
Answered by bobpursley
what is the formula PI*diameter=Cicumference used for?
Answered by jenna
i am confused??
Answered by jenna
the pi is 3.14
Answered by bobpursley
C=PI*diameter.

You need to get this down.
Answered by jenna
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?
Answered by Milton
I asked the question the other way. I know the circumference is 13". What's the diameter?