Question

what is a distance around a circle called?

Answer 1

Circumference
the radius is the half distance going through the center.

Answer 2

The distance around the circle is called the CIRCUMFERENCE

Answer 3

The distance around a circle is called the circumference. The distance across a circle through the center is called the diameter. Pi is the ratio of the circumference of a circle to the diameter. Thus, for any circle, if you divide the circumference by the diameter, you get a value close to Pi. This relationship is expressed in the following formula: spacecircumference of a circle
Pi is the ratio of the circumference of a circle to its diameter