Question

(x + 5)2 + (y - 7)2 = 36, its radius is

Answer 1

The answer would be 6

Steps: The equation of a circle is (x – h)² + (y – k)² = r²; since we are trying to find the radius we are going to focus on the r². Now if you look the equation has the 36 filled in as the r² so r² = 36; we now have to isolate the r to get the radius, how do we get the radius? We Square root the r² and 36. After we get r = 6, The radius is 6 units