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OpenStudy (anonymous):
If A(x1,y1) , B(x2,y2) , C(x3, y3) and D(x4,y4) form two line segments, AB and CD, which condition needs to be met to prove AB is perpendicular to CD ?
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OpenStudy (alekos):
slope of AB x slope of CD = -1
OpenStudy (alekos):
whats the slope of AB?
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