# algebra

Find the equation of the circle for which a diameter has endpoints P1(-1, 4) and P2(-5, 2).

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1. centre would be the midpoint of the the two given points, which would be C(-3,3)

so the equation is
(x+3)^2 + (y-3)^2 = r^2
plug in one of the points given to find r^2

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