the circumfrence of a circle is pi times it's radius squared.
18.84
25.1
Pi times radius squared.
radius = circumference/(2*pi)
The circumference is about 31.415 units.
two times the radius times pi
The circumfrence is like a perimeter. It is the area around a circle. You can find the circumfrence of a circle by using this formula. Pi x R2 or Pi times the radius squared.
8 divided by (2*pi) = a radius of 1.273239545 linear units
Circumference of a circle = 2*pi*radius or pi*diameter
Circumfrence=diameter X 3.14 (diameter=2 X radius)
If you do not have the area, what do you have? The radius is half the diamiter The radius is PieR2 Worked backwards if you know the circumfrence.