SOLUTION: Please help me solve this problem: What is the equation of a circle that has a diameter with endpoints (1,3) and (-3,1)

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Question 806453: Please help me solve this problem:
What is the equation of a circle that has a diameter with endpoints (1,3) and (-3,1)

Answer by Alan3354(69443) About Me  (Show Source):
You can put this solution on YOUR website!
What is the equation of a circle that has a diameter with endpoints (1,3) and (-3,1)
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The center of the circle is the midpoint.
The radius is the distance from the midpoint to either given point.
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Call the midpoint is (h,k), then
%28x-h%29%5E2+%2B+%28y-k%29%5E2+=+r%5E2