2 pi r and pi r 2
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The formula for the area of a circle is pi * radius squared. The circumference of a circle's formula is pi * diameter. NOTE: pi equals approx. 3.14
Divide the circumference by (2 x pi) to get the radius. Then use the formula for the area of the circle.
It isn't. That is the formula for the AREA of a circle!
Divide by pi then divide by 2 then square the number and then multiply by pi
Area of a circle = pi*radius squared Circumference of a circle = 2*pi*radius or diameter*pi