Area 4 pi, circumference 4 pi! This is because 2 is the only number equal to half of its square.
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radius = circumference/2*pi
find the circumferance as if it was a whole circle but when you get the answer divide it by 2
divide the circumference by 3.14 to get the diameter - then divide that by 1/2 to get the radius Radius = Circumference / 2 x pi from C = Diameter x pi
The formula for the area of a circle is: Area = (pi) x (Radius)2 . When you know the radius of the circle and you use it to calculate the area of the circle, the result will be equal to (pi) x (Radius)2 .
A circle with a radius of 2 cm has an area of 12.57 square cm.