Find the Center and Radius of the Sphere $x ^ { 2 } + y ^ { 2 } + z ^ { 2 } - 4 x + 4 - 8 y = 0$

question 92

Multiple Choice

Find the center and radius of the sphere. $x ^ { 2 } + y ^ { 2 } + z ^ { 2 } - 4 x + 4 - 8 y = 0$

• A) \(C ( 2,2,4 ) ; r = \sqrt { 2 }\)
• B) \(C ( 0,2,4 ) ; r = 4\)
• C) \(C ( 2,4,0 ) ; r = \sqrt { 2 }\)
• D) \(C ( 2,4,0 ) ; r = 2\)
• E)none of these

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Definitions:

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