Question

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

u = <2, -4>, v = <3, -8>

Answer 1

Have you learnt the cosine rule or the cosine law or however you call it?

Answer 2

If no, you can find the angles of them to x-axis and subtract them

Answer 3

i don't know how to do that

Answer 4

do you know how to take the "dot product"?

Answer 5

@Zaria602 tangent is the way to go

Answer 6

But this time it involves negative number... so you can't draw a diagram

Answer 7

\[\tan^{-1}\frac yx\]

Answer 8

@satellite73 i tried but its not working for me

Answer 9

Can you show us your results?