pi
A circle with a radius of 21 units has an area of 1,385.44 square units.
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.
Just like any other circle, the area of that one is (pi) times (the square of the radius).
6
The area of a circle with a radius of 14.4 is 651.4
Area of a circle = pi*radius squared
The area of a circle of radius 21 is 1386
The area of a circle if the radius is 9m 254.5m2
The radius of a circle with the area of 36 is 3.385
A circle with a radius of 135 units has an area of 57,255.53 square units.
The area of a circle with a radius of 2m is: 12.566 m2
If the area of a circle is 40.7 the radius is: about 3.6 (3.599)