Mathematics, 26.06.2019 23:10, aprilkenedy12

If a(x1, y1), b(x2, y2), c(x3, y3) and d(x4, y4) form two lines segments, ab and cd, which condition needs to be met to prove ab _|_ cd?

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If a(x1, y1), b(x2, y2), c(x3, y3) and d(x4, y4) form two lines segments, ab and cd, which condition...