SOLUTION: The equation (x−1)2+(y−3)2=r2 represents circle A. The point B(4, 7) lies on the circle. What is r, the length of the radius of circle A?

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Question 1031324: The equation (x−1)2+(y−3)2=r2 represents circle A. The point B(4, 7) lies on the circle. What is r, the length of the radius of circle A?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
r=sqrt%28%284-1%29%5E2%2B%287-3%29%5E2%29, simply using the variable r solved in terms of x and y and then just substituting the coordinates of the given point B.