Q: What is the formula to be used if the diameter is given?

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divide diameter by 2

C=Pi x diameter

(pi)D

diameter = circumference/pi (pi = 3.14159265 or 3.14 for rough approximation).

That depends what shape you are talking about.

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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

divide diameter by 2

C=Pi x diameter

Circumference = (diameter) multiplied by (pi)

Circumference of a circle = (pi) x (diameter)

Radius is half of the diameter, so you can easily come up with a formula: L = 0.25 * pi * d2

(pi)D

in place of r (radius) write d/2 where d is diameter

Circumfrence=diameter X 3.14 (diameter=2 X radius)

diameter = circumference/pi (pi = 3.14159265 or 3.14 for rough approximation).

You just multiply the given radius by 2. That is diameter is just double of the radius. This is universal formula.

That depends what shape you are talking about.