I really need help with this, I have looked over some of my friends notes and my own?

Question

In the standard equation of a circle, (x - h)2 + (y - k)2 = r2, what does (h, k) represent?

A) the length of the radius

B) the length of the diameter

C) the coordinates of the center of the circle

D) the coordinates of the endpoints of the diameter

2. The equation of a circle is (x + 4)2 + (y + 6)2 = 16. Determine the length of the radius.

A) 10

B) 4

C) 16

D) 8

Answer 1

1) In the standard form of circle equation

(h , k ) represents the coordinates of the center of the circle.

Option C is correct choice.

2) The circle equation is

Compare it to standard form of circle equation .

Length of the radius = 4.