Circumference= 2(Pi)r
so just work backwards :)
To find the radius of a circle given its circumference divide the cirumference by 2 times pi
It depends on what information you do have about the circle. For example, circumference = 2*pi*radius.
It is: 2*pi*radius
The circumference of a circle: 2*pi*radius or pi*diameter
Radius would be 16 in. (2x8 in.). Circumference would be approximately 50.27 in. (16 x pi, which is approximately 3.1416).
The area of a circle is pi times radius squared
circumference=pi x diameter
75.37
Basically, the circumference of a circle is the perimeter of the circle.
Divide the Diameter by 2 to get the Radius
Circumference of a circle = 2*pi*radius
Area of Circle = pi (radius)2 So , using this formula we can find the radius and also the diameter. Diameter = 2(radius)