- #1
Robb
- 225
- 8
Homework Statement
FInd the angle theta between AB and AC. a-1.7m, b=1.3m
masteringengineering.com says my answer is wrong. I'm not sure of any other way to do the problem. Please advise.
Homework Equations
A(3, 0, 0) B(0, -.75, 1.3) C(0, 1.7, 1.5)
The Attempt at a Solution
r(AC)= -3i +1.7j + 1.5k
r(AB)= -3i -.75j +1.3k
r(ACmag)*r(ABmag)= 13.3
r(AB)*r(AC)= 9.67
arccos(9.67/13.3)= 43.4