Answer: The radius of the circle would be 3.
Step-by-step explanation:
The distance between the center coordinate and point on the circle will give you the radius. So use the distance formula to find the radius.
D = √(x2-x1)^2 + (y2-y1)^2
D = √(4 - 1)^2 + (2 - 2)^2
D = 3
