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Circle Calculator

Notes and Formulas for a Circle:

Given the radius find the area and circumference
- a = Π * r^2
- c = 2 * Π * r
Given the area find the radius and circumference
- r = square root (a / Π)
- c = 2 * Π * r
Given the circumference find the radius and area
- r = square root (a / Π)
- a = Π * r^2

Circle Diagram with Radius
r = radius
a = area
c = circumference
Π = Pi