Question

Suppose the radius of a circle is 3 units. What is its circumference?

Answer 1

c=18.85

Explanation:

c=2
`\pi`r

Substitute 3 in for r

c=2
`\pi`3

c=6
`\pi`

c=18.849555921...

Rounded to the nearest hundreth

c=18.85

Hope this helps!

Answer 2

Explanation:

the formula for working out the circumference is:

`2\pi r\\\pi d`

so to work this out you could multiply the radius by 2 to give 6 and then multiply that by pi to give you 18.84956

`3*2=6\\6*\pi`

=18.84956