math
posted by Dan .
How do you find the circumference of a circle?

Circumference = pi times radius squared.
C = pi * r^2 
Answer of Ms.Sue is wrong.
The circumference is the distance around a closed curve. Circumference is a special perimeter.
The circumference of a circle is the length around it. The circumference of a circle can be calculated using the formulas:
C=d*pi
Wher d is diameter
OR
C=2*r*pi
Wher r is radius 
You can check that.
In google type: Circumference
When you see list of results click on :
CircumferenceWikipedia,the free encyclopedia 
Ooops! I goofed again! I guess I'd better screw my head on tighter.
Of course, Bosnian is right.
C = pi * diameter
I gave the formula for the area.