Question

Hi, the area of a circle is 100 sq. mm. The radius is 5.64 mm. What is the circumference?

Answer 1

11.28π mm

1) Since the area is 100 mm² we can plug into the Circumference formula to find out the perimeter of that circle

2)

`\begin{gathered} C=2\pi\cdot r \\ C=2\cdot\pi\cdot(5.64)^{} \\ C=11.28\pi \end{gathered}`

3) Hence, the circumference of that circle is 11.28π mm