The angle between A and negative x-axis:
α = tan-1(4.60/3.80) = 50.4° above the negative x-axis.
The angle measured anticlockwise from B, θ1 = 180 - 50.4 = 129.6°
Find the angle between each of the following pairs of vectors A = Axi+Ayj and B = Bxi+Byj
A) Ax1=-3.80, Ay1=4.60, Bx1=1.20, By1=-2.90
B) Ax2=2.00, Ay2=6.00, Bx2=10.0, By2=5.20
C) Ax3=-4.00, Ay3=2.00, Bx3=7.00, By3=14.00
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