the points A (1, 5), B (5, 5) and C (5, 1) are 3 corners of a square ABCD. what are the coordinates of D, the 4th corner
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Sorry this just got deleted :( ill post it again
= 7
I'm sorry I'm bad at explaining how i solved it
= 7
I'm sorry I'm bad at explaining how i solved it
The diameter of a circle by definition goes from one "side" of the circle to the other "side" and goes through the center. If we are given the coordinates of the endpoints of the diameter, we need to find the midpoint of that segment to find the center of the circle. The midpoint formula is as follows 
. Filling in accordingly, we have 
. Doing the math on that gives us a midpoint of (-7, -6), which is also the center of the circle.