Mathematics, 20.10.2019 12:00, CamBroOkaii2590

Atriangle has vertices a(-1,3,4) , b(3,-1,1,) and c(5,1,1). prove that it is right-angled? and how do you determine the fourth vertex needed to complete a triangle? .

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Atriangle has vertices a(-1,3,4) , b(3,-1,1,) and c(5,1,1). prove that it is right-angled? and how...