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Question

Which of the following gives the equation of director circle of the ellipse x225+y216=1?



A

x2 - y2 = 9

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B

x2 + y2 = 41

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C

x2 + y2 = 9  

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D

x2 + y2 = 25

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Solution

The correct option is B

x2 + y2 = 41


The equation of director circle of the ellipse x2a2+y2b2=1 is x2+y2=a2+b2

 Director circle of x225+y216=1 is, 

x2+y2=41


Mathematics

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