Hello, rcmango!
Did you work out the vectors?
Find the volume of the parallelepiped with adjacent edges
We have: .
Then: .
. . Hence: . etc.
P(2, 0, -1), Q(4, 1, 0), R(3, -1, 1), S(2, -2, 2)
must find the volume of the parallelepiped with adjacent edges PQ PR and PS.
I tried setting it up and i still didn't come out with the correct answer of 3
...whats confusing me is the amount of points above, there are 4 now, instead of 2, or 3.
please help.
okay i see,
after i calculated PQ PR and PS
ex: PQ (4-2) + (1-0) + (0+1) 2, 1, 1 ........... and the others....
i used their cross product for:
i came out with 2*(2-(-4) - 1(3-0) + 1(-2 - 0)
everything looks fine except i got a -3,
thats very close though, probably just another wrong negative somewhere i did.
thanks for the help.