You may want to review (Pages 19 - 24).
For related problemsolving tips and strategies, you may want to view a Video Tutor Solution of Finding an angle with the scalar product.
Ax1= -2.40, Ay1= 6.20; Bx1= 2.10, By1= -2.90.
Ax2= 3.20, Ay2= 5.20; Bx2= 11.2, By2= 6.20.
Ax3 = -4.00, Ay3 = 2.00; Bx3 = 7.00, By3 = 14.00.
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