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Show that the points (5, 5), (6, 4), (-2...

Show that the points `(5, 5), (6, 4), (-2, 4) and (7, 1)`, all lie on a circle. Find its equation, centre and radius.`

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The correct Answer is:
`x^(2) + y^(2) - 4x -2y - 20 = 0 ` (2,1) , 5 .
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