Question #31fcf

1 Answer
Jan 9, 2018

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

Explanation:

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.