10pi, ie 31.415 inches.
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The circumference of a circle 5cm in radius is about 31.42cm
The circumference of a circle if the radius is 5 cm is: 31.42 cm (radius x 2 x Pi = circumference).
The radius of the circle works out as 5 units in length
Circumference = 2 × π × radius → circumference = 2 × π × 5 ≈ 31.42 units
Circumference = 2*pi*radius In this case radius = 5 units so circumference = 31.4159 units approx.