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How can we determine whether the triangles $ABC$ and $DEF$ are rectangles? We have $A(-6,5),B(-3,3),C(1,9),D(1,3),E(5,1),F(11,10)$.

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    At least in spanish, a right angle triangle is called "triángulo rectángulo"="rectangle-triangle", for the pretty obvious reason. Most probably this what the OP means to ask: are those triangles right-angled ones?2012-11-20

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