It depends on the values you have. The base of a cylinder is a circle.
If you know the circle's diameter, half it to find the radius.
If you know the circle's circumference, divide by 2pi to find the radius.
If you know the circle's area, divide by pi and take the square root to find the radius.
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The area for the base of a cylinder is the area of a circle. pi times radius squared.
With the area of the base known, you can back figure to the radius. But unless you know the cylinder's volume, or are told that it's height is equal to the radius or diameter or circumference of the base, there's no way to find the height short of measuring it. To find the radius, you take the area of the base and divide it by pi. The resulting dividend is r2. Find the square root of the dividend, and you have the radius.
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Volume= 3.14 multiplied by radius of base to the second power multiplied by height of cylinder
If the volume of a cylinder is 300 and the height is 3, the radius of the base is: 5.65