Which of the Following Is the Equation of a Circle $x ^ { 2 } - y ^ { 2 } = 81$

question 55

Multiple Choice

Which of the following is the equation of a circle?

• A) \(x ^ { 2 } - y ^ { 2 } = 81\)
• B) \(( x - 5 ) ^ { 2 } + y ^ { 2 } = 49\)
• C) \(y = 9 x ^ { 2 } + 5\)
• D) \(( x - 5 ) + ( y - 9 ) ^ { 2 } = 49\)

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