18π
Explanation: The formula for finding the circumference of a circle is C=2πr, where r is the radius of the circle. In this case, the radius is 9cm, so the circumference would be 2π(9) = 18π.
12. Find the circumference of the circle shown below in terms of pi.
The circle has a radius of 9cm
9π
18π
81π
324π
1 answer