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What is the equation of the circle with center (2, –5) that passes through the point (–2, 10)?

can someone explain this to me please

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(x-2)^2 + (y+5)^2 = r^2

16 + 225 = r^2
r^2 = 241

(x-2)^2 + (y+5)^2 = 241

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