Determine A•B by adding component products?
Ax = 1
Ay=0
Bx=-1
By=0
Determine A•B by adding component products
Determine A•B by using magnitudes and the angle between A and B
Are they parallel, perpendicular, or neigther?
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A = 1i ---> lAl =1
B = 1i ---> lBl = 1
A . B = 1
A . B = lAl lBl cos θ
1 = 1 * 1 cos θ
cos θ = 1 -----> θ = 0 ( they are parallel)