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Q: How do you find the radius and diameter of the circle if you know the area?

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Area of a circle = pi times radius squaredDiameter of a circle = 2 times radius

Area = Pi(radius)squared. You only need the radius of a circle to find the area. To find the radius, when you have the diameter, divide the diameter by 2, because the diameter forms two radii. After you have found the radius, plug in the radius into the area equation: Area = Pi(radius)squared In other words, you can say the other equation for the area of a circle is: Area = Pi(1/2Diameter)squared

All you have to do is multiply the radius by 2.

pi*radius2 = area of a circle radius2 = area/pi radius = square root of (area/pi) diameter = 2*radius

Area of a circle = pi*radius2 Radius = diameter/2

By dividing its diameter by 2 is equal to the radius of a circle and its area is pi*radius2

Circumference of a circle = 2*pi*radius or diameter*pi Area of a circle = pi*radius squared

If you have the circumference: circumference = (pi) * diameter diameter = circumference / (pi) If you have the area: area = (pi) * radius * radius radius = square_root(area / pi) radius = diameter / 2 diameter = 2 * square_root(area / pi)

Since the area of a circle is (Pi)times(Radius squared) then you would reverse the process to find the radius, and hence, the diameter. Divide the area by Pi (3.14159...) and you would have the radius squared. Take the square root of that and you have the radius. To get the diameter, multiply the radius by 2.

To find the circumference of a circle then multiply pi (3.14159265...) by the diameter of the circle. To find the area then multiply pi by the radius squared.

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

In this case, the radius is easiest calculated from the diameter. The radius is simply half the diameter.

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