given ends of diameter

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Analytical Geometry
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If the ends of a diameter are A(x1, y1) and B(x2, y2), the equation of the circle is?
A
(x - x1)(x - x2) + (y - y1)(y - y2) = 0
B
(x - h)² + (y - k)² = r²
C
x² + y² = r²
D
(x + x1)(y + y2) = 0
Analysis & Theory

When ends of a diameter are given, the circle’s equation is (x - x1)(x - x2) + (y - y1)(y - y2) = 0.