The circumference of a circle is 2*pi*radius or pi*diameter
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The circumference of a circle is equal to its diameter times pi. This is also equal to two times its radius times pi.
Circumference = pi (3.14) times the diameter (radius times two) Area = pi (3.14) times the radius squared
Radius is diameter divided by two. Diameter is radius times two or circumference divided by pi. Circumference is diameter times pi. Pi is roughly 3.14
circumference = 2 x π x radius ⇒ radius = circumference ÷ (2 x π) Divide the circumference by two times π (≈ 6.283).
well the circumference is equal to pi times the diameter, so all that you have to do is divide the circumference by pi to get the diameter. Then you divide the diameter by two to get the radius.