What do you have? The area of the circle or the circumference?
Area: divide the area by pi, then square root it
Circumference: divide the circumference by 2 then divide it by pi
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By using the equation 2πr that is used to find the circumference, you get 12.56m
Type your answer here. Find the radius for a circle with the equation x2 plus y2 equals 9? ..
The area of a circle is pi(radius)2 Radius is half the diameter. Simply divide the diameter in half and enter it into the equation 3.14(diameter/2)2
Area of a circle = (pi) (R2)R = radius of the circle = 1/2 of its diameter
If you have the radius of the circle then just plug it into the equation which ispi x r2This equation is used to find the area of a circleSo if your radius is 5 then all you do is 52 and then multiply by piHope that helps.Jamz159