Question

The diameter of a round skating rink is 18m. Find the circumference of the rink to the nearest meter.

Answer 1

As the diameter is 18, a radius is half the diamater ergo the radius is 9.

Use the circumference formula:
$2 \pi r$

So, adapted it would be:
2 * π * 9 which would be 56.7.

The circumference is 57m.

Hope this helps!