In the xy-plane, the center of circle C is at point (0,0). If the point (−5,5) is on the circumference of the circle, what is the radius of the circle?

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In the <em>xy</em>-plane, the center of circle <em>C</em> is at point (0,0). If the point (−5,5) is on the circumference of the circle, what is the radius of the circle?