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You multiply the diameter by Pi, that is 3.14159 (to the nearest 5th decimal).

circumf. = dia. x Pi.

Q: How do you find the circumfrance of a cirlce if you know the diameter?

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you multiply the diameter by pi.

It depends what you know. The top of a cylinder is in the shape of a circle. So, to find the diameter of the cylinder (which is also the diameter of the circle), if you know the radius, just multiply it by two.

The radius is exactly 1/2 of the diameter.

The radius is half of the diameter so you divide the diameter in half. (divide by 2) If your trying to find the diameter if you have the radius you double it (multiply by 2)

Diameter = circumference/pi

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To find the circumfrance of a circle, you need to multiply 2 times pi, times the circle's radius. If you don't know what that is, you multiply two times pi, and pi equals 3.14, and then multiply that by the radius, which is the measurement of half the circl'e diameter. the diameter is the distance from one side of the circle, to the exact opposite. you measure this with a ruler. HALF the measurement of the diameter is the radius. Example---the diameter of a circle is 20 cm. half the diameter is 10 cm, which is the radius. Multiply 2 times pi[which equals 3.14], times the radius. Good luck!

The circumference of a cirlce can be found if you know either the diameter (the longest distance from on side on the circle to another) or th radius (half of the diameter). If you know the radius, multiply it by 2 to find the diameter. The cricumference = pi x D This means you times the diameter by pi (3.1415926535...)

You divide the diameter by two.

Circumference = Pi * diameter

To find the diameter of a circle, you will either need to know the area or its circumference. If you know the area: diameter = 2 x squareroot(area / Pi) If you know the circumference diameter = circumference / Pi

circumference/pi = diameter

Diameter = 2*Radius

You divide the diameter in half.

Divide your diameter by two

you multiply the diameter by pi.

To find the diameter you need to know what the radius of the circle which is from the center to the circumference ,the edge, then you times it by two and that's how yo find the diameter

Divide the known circumference by pi to find the diameter of the circle.