Multiply the diameter by pi, which is about 3.14.
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Circumference of circle: 28 times pi inches
Circumference=2diameter(pi) C=2(28)(pi) C=175.92918860102842135390802946365
The diameter would be 28 cm.
14 cm
pi = 3.1416 ( a constant) Circumference = 2 * pi * radius, so radius = circumference / (2 * pi) So radius = 28 / ( 2 * 3.1416 ) = 4.456 units