Question

The diameter of a circle has endpoints whose coordinates are R(-2, 2) and S(4, 2).
The radius of the circle has length _____.

3
6

Answer 1

what is the distance between those points the radius is half the diameter

Answer 2

the dots are the endpoints of the circle. Count how many units are in between the endpoints.

That will give you the diameter (how far across it is) to find the radius, just take half of the diameter