Question

Given the center (1,2) and the point (4,2) is on the circle, what is the radius
of the circle?

Answer 1

Answer: The radius of the circle would be 3.

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