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Questions  

ABCD is a square whose side is a. The equation of the circle circumscribing the square, taking AB and AD as axes of reference, is  

a
x2+y2+ax+ay=0
b
x2+y2+ax−ay=0
c
x2+y2−ax−ay=0
d
x2+y2−ax+ay=0

detailed solution

Correct option is C

The circle passes through (0, 0), (a, 0), (0, a) and  (a, a)Hence , the required equation is x2+y2−ax−ay=0

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