What is the diameter of the circle given by the equation (x + 7) 2 + (y + 2) 2 = 121?

A.

22

B.

33

C.

11

D.

5.5

A.

22

Step-by-step explanation:

The equation of the circle is written in the form

(x-h) ^2 + (y-k) ^2 = r^2

So

(x + 7) 2 + (y + 2) 2 = 11^2

The radius is 11

The diameter is twice the radius, so the diameter is 2*11 = 22