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Answer 1 · 2018-01-09T02:47:21

The circumference of a circle with a diameter of exactly #9pi#cm or approximately #28.26#cm.

The number Pi (#pi#) is known as the ratio between the circumference and the diameter of any circle.

Where #C# is the circumference of the circle and #d# is the diameter:

#pi = C/d#

We may rearrange this to isolate our desired dimension (circumference).

Multiply by #d# on both sides.

#pid = C#

OR

#C = pid#

Now, use your known diameter with this formula.

#C = pi * 9#

The circumference is exactly #9pi# cm or approximately #28.26# using cm #pi ~~ 3.14#.