Question

A circle has a radius of 9 mm. What is its circumference?
Use 3.14 for a

Answer 1

Answer:

56.52 mm

Step-by-step explanation:

The circumference of a circle is given by

C = 2 * pi *

C = 2 * 3.14 * 9

C = 56.52

Answer 2

Answer:

$56.52\text{ mm}$

Step-by-step explanation:

The circumference of a circle with radius $r$ is given by $A=2r\pi$.

We're given a radius of 9 mm and told to use $\pi=3.14$. Substituting these values, we get:

$A=2(9)(3.14),\\A=\boxed{56.52\text{ mm}}$