It's simple, just multiply de diameter of the circle by the pi number: 3.141592653....
the result is 31.14 cm, or 314 milimeters.
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Circumference of the circle is 2*pi*10 = about 63 cm rounded up.
A circle with a radius of 2.8 centimeters has a circumference of 17.59 centimeters.
The diameter of a circle that has a circumference of 125 centimeters is: 39.79 cm (circumference divided by Pi = diameter).
A circle has the radius of 27.7 cm what is the approximate circumference of the circle? The circumference is approx. 174 centimeters.
If the diameter of a circle is 18 centimeters the circumference will be about 56.55 cm (d x Pi = C)