Do you know
?
where
the 4 points A,B,C and D have the following co-ordinates in a Cartesian coordinate system A = (2,2,2), B = (5,2,4), C = (-2,4,-1), D = (0,0,6).
i) find the volume of the parallelepiped whose edges are the lines AB,AC and AD.
ii)calculate the angle BAC