Find the Center (H, K) and Radius R of the Circle

question 136

Multiple Choice

Find the center (h, k) and radius r of the circle with the given equation.
- $$x ^ { 2 } + y ^ { 2 } = 9$$

• A) \(( h , k ) = ( 0,0 ) ; r = 3\)
• B) \(( h , k ) = ( 3,3 ) ; r = 3\)
• C) \(( h , k ) = ( 3,3 ) ; r = 9\)
• D) \(( h , k ) = ( 0,0 ) ; r = 9\)