Maths: Circle problems, area, circumference, diameter and radius.

This is a problem on IXL. 

To work this out you need to write down what you already know.

Radius= 3 

Circumference= ?

To work out the circumference you need to use the right formula which is 2×π×r=

2 times π is 6.28. So then you need to do 6.28×3 which is 18.84

So the answer is 18.84.