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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
If 4 is the radius, radius squared means to multiply the radius by itself, in this case 4 x 4.
pi radius squared. (radius squared, then multiply by pi.)
circumference: Pi(3.14) x radius squared Diameter: radius squared radius: diameter divided by 2
Divide the diameter by 2, this will give you the radius. multiply the radius by the radius, this gives you the radius squared. Multiply the raduis squared by Pi (3.14) to get the circumference. Formula : Circumfrence = Pi X R squared so, if the diameter is 10, the radius is 5, the radius squared is 25, 25 X 3.14= circumference