Q: How do you work out the diameter?

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diameter = 2rarea = pi*r^2

Circumference = pi*diameter or 2*pi*radius

The question is in really bad english, but I'm guessing your meant: 'How do I work out the diameter using pi?' Diameter= Radius2 You don't need to use Pi to work out the diameter. Unless you have a question that doesn't show you the radius. Then you do Area divided by Pi which equals the Diameter.

it uses to find out thearea and circumference of circle. diameter=2*radius

Divide the circumference by 3.14159265 (3.14 for rough approximation) to find the diameter of a circle.

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diameter = 2rarea = pi*r^2

Circumference = pi*diameter or 2*pi*radius

The hot work ratio is the area ratio of the cast diameter and the pre-machined finished diameter.

The question is in really bad english, but I'm guessing your meant: 'How do I work out the diameter using pi?' Diameter= Radius2 You don't need to use Pi to work out the diameter. Unless you have a question that doesn't show you the radius. Then you do Area divided by Pi which equals the Diameter.

it uses to find out thearea and circumference of circle. diameter=2*radius

Divide the circumference by 3.14159265 (3.14 for rough approximation) to find the diameter of a circle.

It is the ratio of the circumference (C) and the diameter (D) of a circle. Using pi and the diameter of a circle, you can work out the circumference.

circumference = pi*100mm

The answer will depend on what information you have: radius, area, diameter.

Divide the cirumference by 3.14

The value of pi = circumference/diameter

EDIT: To find the diameter, using the circumference - you divide the circumference by the value of Pi - Snakester1962 (Supervisor)