-Use the dot product to prove that the quadrilateral with vertices A(-4,1) B(4,5) C(7,-1) and D(-1,-5) is a rectangle.(adsbygoogle = window.adsbygoogle || []).push({});

I tried find AB dot BC = 0, but I'm not getting 0. So I'm stumped. Can someone help me out? =/

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# Homework Help: Dot Product help

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