Demonstrates how to complete the square to find the center and radius of a circle. ... The center-radius form of the circle equation is in the format (x – h)2 + (y – k)2 = r2, with the ... If you end up with an equation like (x + 4)2 + (y + 5)2 = 5, you have to keep straight that h ... That is, the center is at the point (–4, –5), not at (4, 5).
