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If you know the circle's area then the radius can be found:

pi*radius2 = area

Divide both sides by pi:

radius2 = area/pi

Square root both sides:

radius = the square root of (area/pi)

Q: How do you find the radius of a circle without the diameter or circumference?

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the equation for the circumference of a circle is 2*radius*pi, or since the radius is half of the diameter 2*radius=diameter, we can simplify the equation to the circumference of a circle=diameter*pi

radius is half the diameter of a circle.

To find the circumference of a circle, you need only know the radius or diameter of the circle. The circumference of a circle is calculated as 2 x Pi x radius OR Pi x diameter. Pi is approximately 3.1415926.

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

The diameter and the radius of a circle with a circumference of 62.8 meters are:d = 19.98mr = 9.99m

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the equation for the circumference of a circle is 2*radius*pi, or since the radius is half of the diameter 2*radius=diameter, we can simplify the equation to the circumference of a circle=diameter*pi

The diameter and radius of a circle if the circumference is 37.68 are:Diameter = 11.99Radius = 5.997

If the circumference or diameter is given then you can find the radius or simply measure the distance from the centre of the circle to the circumference.

radius is half the diameter of a circle.

The circumference of a circle equals the diameter times pi. The diameter is two times the radius. So a circle with a radius of 6 would have a diameter of 12, and a circumference of 12pi.

To find the circumference of a circle, you need only know the radius or diameter of the circle. The circumference of a circle is calculated as 2 x Pi x radius OR Pi x diameter. Pi is approximately 3.1415926.

The diameter of any circle is twice its radius.

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

If you are given the radius of the circle, you can use the formula: diameter = 2*radius If you are given the circumference of the circle, you can use the formula: diameter = circumference/pi

The circumference of any circle is (pi) x (diameter),and of course, the diameter is double the radius.

The radius and diameter of a circle whose circumference is 25.12 are:r = 4d = 8