25.1
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The circumference is 25.1
In order to fully understand what the radius of a given circle is, you must know the diameter. The diameter is the distance across the circle through the center. The radius of a circle is half the diameter. For example, if the diameter of a circle is 8 inches, then the radius would be 4 inches.
A=pi x radius squared Example: circle with a radius of 2 would be worked out like this: 2 squared (4) x 3.14. Answer= 12.56
A circle has only one measure for its radius. A shape that has a "radius" of 3 in by 4 in cannot be a circle.
The radius of the circle is 2 units. * * * * * If the area is 4 units, the radius is 1.128 units