Kenneth S. answered 10/24/17
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
Find the coordinates of the center by finding the midpoint of the diameter, given its two endpoints.
Find the radius by using half of the length of the diameter, given its two endpoints.
You will then know C(h,k) and r, and can write (x-h)2 + (y-k)2= r2 with those specific numbers of h, k & r.