How can we determine whether the triangles $ABC$ and $DEF$ are rectangles? We have $A(-6,5),B(-3,3),C(1,9),D(1,3),E(5,1),F(11,10)$.
Determine whether the triangles $ABC$ and $DEF$ are rectangles
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geometry
euclidean-geometry
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4At 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