u dot v = |u||v| cos T
|u| = sqrt(9+4) = sqrt 13
|v| = 4
u dot v = 12 + 0 = 12
so
12 = 4 sqrt(13) cos T
cos T = .832
T = 33.7 degrees
do the second one the same way
Look for the angle (θ) between the vectors. Remember to round your answer to the nearest tenth.
a.) u=<3,2>
v= <4,0>
b.) u = 2i - 3j
v = i - 2j
1 answer
1 answer