Question

Consider the following.
u = (5, −4), v = (6, 4)

(a) Find u · v.
(b) Find the angle between u and v to the nearest degree.
θ =

for a I got 14 which is right but I don't get how to get the θ ??

Answer 1

u . v = (5,-4).(6,4) = 30 - 16 = 14

u.v = |u||v|costheta

costheta = 14/|u|*|v|

|u| = sqrt(5^2 + 4^2) =
|v| = sqrt(6^2 + 4^2) =

Answer 2

so would it be 37?

Answer 3

72.35 degrees

Answer 4

wait how??

Answer 5

it would be costheta = 7/1066

Answer 6

ohh i got it thanks a bunch

Answer 7

Any time.