Multiply the diameter by 'pi' .
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the distance around a circle
If the circle's circunference is 128 then radius is 128/2pi = about 20.372 inches
The value of pi is the relationship of a circunference to its diameter. For instance, if you have a circle whose circunference is 9.42477 cm, you shall have a diameter of 3 cm. Any measure of a circunference divided by its diameter shall generates the same numeric value, the pi number.
π is the ratio between the diameter and the circumference of a circle so the formula would be : Circumference = π x Diameter or alternatively (since the radius is half the diameter) Circumference = 2π x Radius.
how do you calculate the circunference of hemisphere?