
Kenneth S. answered 06/06/18
Tutor
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Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
I will just tell you HOW to do this.
Use the given data in each case to determine two slopes: slope of AB, and slope if BC.
If the product of these two slopes is -1, then those two line segments are perpendicular and therefore angle ABC would measure 90o