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Vectors and Vertices; Maths Question
Topic Started: Feb 12 2014, 10:56 PM (95 Views)
DJ-Habana
C# King
[ *  *  *  *  *  * ]
I want to help a friend with a maths assignment, however I cannot remember a thing :/

A triangle ABC has vertices at points A(2,-1,4) , B(3, -2,5) and C(-1,6,2). Find, in the
form ai+bj+ck, the vector AB, BC and CA and hence find the lengths of the sides of
the triangle. Check whether side AB is perpendicular to BC

This is what I do remember
1)hence find the lengths of the sides of the triangle

but I do not remember Find, in the form ai+bj+ck, the vector
Is it something like 2i-1j+4k 3i-2j+5k -i+6j+2k ?

And then I really can't remember how to do "Check whether side AB is perpendicular to BC"
I've searched on google, but my math reading skills sucks since I started to work (boring Asp.net all the time, well what I have to do is boring)

If I do the cross product I get
3i -2j -1k, thus I am saying AB is not Perpedicular to BC.
Can anyone say this is right or wrong please
Edited by DJ-Habana, Feb 12 2014, 11:11 PM.
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