Vector direction:

$\overline{){\mathbf{tan}}{\mathbf{\theta}}{\mathbf{=}}\frac{\mathbf{y}}{\mathbf{x}}}$

a + d = 2i + 2j

θ_{a+d} = tan^{-1 }(y/x) = tan^{-1} (2/2) = 45°

f + c = -1i + 2j + 1i = 2j

The vector is pointing in the positive y-axis. Posive y-axis is directed 90° from the positive x-axis counter clockwise.

θ_{f+c} = 90°

a + b = 2i - 2j

Six vectors (a through f ) have the magnitudes and directions indicated in the figure. (Figure 1)

Rank the vector combinations on the basis of their angle, measured counterclockwise from the positive x-axis. Vectors parallel to the positive x-axis have an angle of 0°. All angle measures fall between 0° and 360°.

Rank from largest to smallest. To rank items as equivalent, overlap them.

a+d

f+c

a+b

a+e

a+c

d

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