Mathematics, 29.01.2020 04:58, isabelperez063

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?
an...