Question

HELP PLEASE!!!!
Find the angle between the given vectors to the nearest tenth of a degree.

u = <6, -1>, v = <7, -4>

Answer 1

20.3°

10.2°

0.2°

30.3°

Answer 2

@UnkleRhaukus @Hero

Answer 3

and just calculate the vector angels with respect to the x- axis and subtract the angle from u from v

Answer 4

You obtain something like angle = tan(-4/7) -tan (-1/6)

Answer 5

and just estimate the tangens and see which is the most acceptable

Answer 6

You can either do it with the tangents as described above (no need to worry about the minus signs) or you can get the cosine via the dot product if u know that, (a dot b)/(magnitude a *magnitude b)