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# The diameter equals 18cm how do I find the area?

Wiki User

2010-03-18 23:16:27

The general equation for the area of a circle is π*r2, where r is the radius of the circle, and π is pi, which is approximately 3.14159. The diameter of a circle is how far it is from one side of the circle to the other, and the radius is how far it is the from edge to the center, thus the radius is half the diameter. Therefore the area is π*(92) ~ 254.47

Wiki User

2010-03-18 23:16:27
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