Formula for finding the circumference of a circle = 2*pi*radius or pi*diameter. 2*pi*10 = 62.83185307 metres. pi*20 = 62.83185307 metres. This can be rounded up as the circumference being 63 metres, correct to the nearest whole metre.
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The circumference of a circle with a radius of 10 inches is about 62.83 inches.
The radius of this circle is 10 units.
A circle with a radius of 10 cm has a circumference of 62.83 cm.
2 pi r = 31.4 2r = 10 r = 5 m
Circumference of the circle is 2*pi*10 = about 63 cm rounded up.