Answer:
4
Step-by-step explanation:
(x - 2)^2 + (y + 4)^2 = r^2
You are given a point on the circle, (2, 0).
Plug in 2 for x and 0 for y.
The only variable remaining is r.
Solve for r which is the radius.
(2 - 2)^2 + (0 + 4)^2 = r^2
0^2 + 4^2 = r^2
16 = r^2
r = 4
Answer: The length of the radius is 4.
