Q: How do you work out the circumferance if the diameter is 100mm?

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15.92mm

The circumference of a circle with a diameter of 31.8mm is about 100mm (99.990265mm)

Circumference equals Diameter times Pi, OR Diameter equals (Circumference)/(Pi). In this case, Diameter equals (130mm)/(Pi or 3.14159) equals 41.38mm

39 inches / pi = 12.4 inches

Radius is half of the diameter, so you can easily come up with a formula: L = 0.25 * pi * d2

Related questions

circumference/pi = diameter

15.92mm

The volume in liters of a 100mm long by 50mm diameter cylinder is: 0.196 liters.

The volume in liters of a cylinder with a diameter of 2000mm and a depth of 100mm is: 314 liters.

circumference = pi*diameter so diameter = circumference/pi = 19.1 metres.

If the diameter is known, don't bother measuring the circumference.Simply multiply the diameter by 'pi'.

Either pi times the diameter or pi times twice the radius (which is the diameter)

Circumference = (pi) x (diameter) = 14 pi = 43.9823 inches (rounded)

What is 27 X 3.14? 27 pi

The circumference of a circle with a diameter of 31.8mm is about 100mm (99.990265mm)

Diameter of circle: 13/pi = 4.138 ft to 3 decimal places

100mm diameter.