It is: 6 cm because pi*62 = 36pi square cm
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Area of a Circle = (pi)(r^2) Diameter = 2r If the diameter of the circle is 12, then the radius has to be 6. If the area of a circle is pi times the square of the radius, and the square of 6 is 36 (6x6), then the area of the circle is 36pi.
The area is 314 cm2
A circle with a radius of 6 units has an area of 113.1 square units.
the area of the circle will be 1/4 of its original area
Area = Pi(r)2 - A circle with a radius of 12 inches has an area of 452.39 square inches.