double the radius
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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.