What is the radius of the circle

In a circle the radius would be the same.

Explanation:

A radius is a straight line from the center of a circle to the circumference of a circle. If you have two or more of them, they are referred to as radii. All radii in a circle will be the same length. The circumference is the outside perimeter of a circle.

It is half of the Diameter, so the distance from the middle of circle to the outside