1.

A circle is drawn on the chord of a circle x2 + y2 = a2 as diameter. The chord lies on the line x + y = a. What is the equation of the circle?

A. x2 + y2 – ax – ay + a2 = 0
B. x2 + y2 – ax – ay = 0
C. x2 + y2 + ax + ay = 0
D. x2 + y2 + ax + ay – 2a2 = 0
Answer» C. x2 + y2 + ax + ay = 0


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