# Show that the points (-2,5), (-2,-1) and (4,-1)all lie on a circle whose center is at (1,2). Find the length of the radius.

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Distance Formula:

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Distance from point (-2,5) to the center (1,2)

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Distance from the point (-2,-1) to the center (1,2)

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Distance from the point (4,-1) to the center (1,2)

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Since the distances of the points to the center is equal then we can say that