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The equation of the circle and its chord...

The equation of the circle and its chord are respectively `x^2 + y^2 = a^2 and x + y = a`. The equation of circle with this chord as diameter is : (A) `x^2 + y^2 + ax + ay + a^2 = 0` (B) `x^2 + y^2 + 2ax + 2ay = 0` (C) `x^2 + y^2 - ax - ay = 0` (D) `ax^2 + ay^2 + x + y = 0`

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