Homework Statement
http://prntscr.com/p7dxt
Here's a screenshot of the revision question.
Homework Equations
The Attempt at a Solution
Co-ordinates of each point
A, (0, 60, 0)
B, (40, 0, 0)
C, (-40, 0, 40)
D, (-60, 0, -60)
Position Vectors
rAB, 40i + -60j + 0k
rAC, -40i + -60j + 40k
rAD...