If the radius of a circle equals $15$15 m, find its circumference.
Give your answer as an exact value.
If the diameter of a circle is equal to $48$48 cm, find its circumference.
Give your answer as an exact value.
If the radius of a circle equals $45$45 cm, find its circumference.
Give your answer as an exact value.
Find the circumference of the circle shown.
Give your answer as an exact value.