19.584
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pi = 3.1416 ( a constant) Circumference = 2 * pi * radius, so radius = circumference / (2 * pi) So radius = 28 / ( 2 * 3.1416 ) = 4.456 units
Circumference=2diameter(pi) C=2(28)(pi) C=175.92918860102842135390802946365
The circumference of a circle with a radius of four is: 25.13
A circle with a radius of 4m has a circumference of 25.133m.
The circumference of a circle that has a radius of 3.2cm is: 20.1cm