Question

Identify the radius for the circle in standard form

x2 + y2 - 12x - 12y + 36 = 0

Question 6 options:

a. 144

b. 12

c. 6

d. 36

Answer 1

The radius of the circle is letter C: 6. You must rewrite the problem in standard form, then solve.

Answer 2

The radius is 6
Complete the square on the equation and get
(x-6)^2 + (y-6)^2 =36
The circle equation is
(x-h)^2 + (y-k)^2 = r^2
Center(h,k) r=radius