Question

The equation of a circle is shown below. Determine the radius.

(x − 1)2 + (y + 1)2 = 121
Select one:
A. 9
B. 10
C. 11
D. 12

Answer 1

compare it with

(x-x1)^2+(y-y1^2=c^2

herre c=radius...

Answer 2

Its 11!!!!

Answer 3

\[(x-h)^2+(y-k)^2=r^2\]
(h,k) are the center of the circle and r is the radius but as you see it is squared so you can take the square root of that value to find the actual radius.