Dia. = circumf. divided by Pi = 10/Pi =~ 3.183 metres (rounded to 3rd decimal).
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Circumference = pi*10 meters
If a circle's diameter is 10, the circumference is: 31.416
The circumference of a 10-inch diameter circle is: 31.42 inches.
Circumference is 31.4159 mm Area is 78.539 mm2
Circumference of circle: 10*pi = about 31.4 inches