Q: How do you calculate radius when diameter is given?

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Circumference = diameter*pi

well if the radius is given then the diameter is : d=2r. as for in a circle the diameter is : d=2(pi)r pi=3.14

Double the Radius to Calculate the Diameter.

diameter = 2 * radius

The diameter by definition because a diameter of a given object is twice its radius.

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Radius of a circle = diameter/2

Circumference = diameter*pi

well if the radius is given then the diameter is : d=2r. as for in a circle the diameter is : d=2(pi)r pi=3.14

Double the Radius to Calculate the Diameter.

diameter = 2 * radius

the radius is half the diameter

The radius is half the diameter.

Radius = Diameter/2.

I guess you mean:"How do you find the radius if you are given the diameter?"You take the diameter and divide it by 2.

divide diameter by 2 = radius

The radius is one half of the diameter. If the diameter is 20, the diameter is 10.

The radius of a circle is half of its diameter.