Kenneth S. answered 03/04/16
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
Just take the average of the x values (coordinates) of points B & C to get the x value (coordinate) of BC's midpoint.
Similarly, take average of the y values of B & C to get the y coordinate of BC's midpoint.
This is equivalent to the so-called midpoint formulas.