Equation of auxiliary circle of (x^(2))...

Equation of auxiliary circle of ` (x^(2))/( 16) - (y^(2))/( 25)= 1 ` is . . . .

A

` x^(2) + y^(2) = 16`

B

` x^(2) + y^(2) = 25`

C

` x^(2) + y^(2) = 9 `

D

` x^(2) + y^(2) = 41 `

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