It depends on what information you do have about the circle. For example, circumference = 2*pi*radius.
Divide the circumference by 2pi
Basically, the circumference of a circle is the perimeter of the circle.
The circumference of a circle: 2*pi*radius or pi*diameter
If you mean circumference of a circle then that is its Latin roots
It is 11.5 feet.
To find the radius of a circle given its circumference divide the cirumference by 2 times pi
the circumference is the distance around a circle. Can be found by diameter * 3.14(pi).
It would be pi x 42 feet
The area of a circle is pi times radius squared
75.37
pi D = 10D = 10 / pi = 3.1831 inches (rounded)