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HecptyAura
To determine the area if the circle, you must know the diameter or the radius of a circle.

If you know the radius of a circle, use this as your formula. Remember: Pi (the greek symbol thingy) is equal to 3.1415. (A is equal to area of the circle and r represents the radius)
[tex]a = \pi {r}^{2} [/tex]
If you know the diameter, just divide the diameter to get the radius then use the same equation.

strawnashton

3.14*r^2

R stands for radius.

So if you are given that the diameter of a circle is 10 feet, we know the radius is half the diameter. So the radius is 5. So the equation is going to be 3.14*5^2 so the area would be about 78.54 feet

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