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

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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)

circumference=pi * diameter radius= 1/2 diameter

(pi)D

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

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

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

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

That depends what shape you are talking about.

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