Question

A circle has a radius of 2.5 inches. What is the circumference of the circle?

Answer 1

The circumference of a circle is found using the formula:

`\begin{gathered} C=\pi\cdot d \\ or \\ C=2\pi\cdot r \\ d=\text{diameter (2r)} \\ r=\text{radius} \end{gathered}`

We have that the radius is 2.5 inches, r = 2.5, we can plug in in the above formula:

`\begin{gathered} C=2\pi\cdot r \\ C=2\pi\cdot2.5=5\pi\approx15.7 \end{gathered}`

Answer: The circumference of the circle is 15.7 inches.