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maths maths help not sure how to do?
Given that coordinates in 3D cartesian for A is (2,3,0), B is (-3,5,0), C is (5,8,10).
Find the angle for <ABC.
help me im really bad when it comes to vector.
1 Answer
- JasubhaiLv 69 years agoFavorite Answer
_ ---> - ----> _ --.>
c=AB=(-5,2,0), a=BC= (8,3,10), b= CA=(-3,-5,-10), c=sqrt29, a=173
-- --
CosB=-- c. a/c.a=--(-5,2,0).(8,3,10)
-------------------- = -- (-25+6)/173.sqrt29= 19/173.sqrt29
173.sqrt29
