Enter any one property of a circle — radius, diameter, circumference, or area — and instantly get all the others. Uses π = 3.14159265…
From C: r = C / (2π), then A = πr². Example: C = 31.416 → r = 5 → A = 78.54.
r = radius | d = 2r | C = 2πr | A = πr²
Example: Radius = 5 → Diameter = 10, Circumference = 31.4159, Area = 78.5398
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