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10 cards from this deck
A scalar (single number), not a vector
∣a∣∣b∣cosθ|\mathbf{a}||\mathbf{b}|\cos\theta∣a∣∣b∣cosθ
a1b1+a2b2+a3b3a_1b_1 + a_2b_2 + a_3b_3a1b1+a2b2+a3b3
Vectors are perpendicular
111
000 (perpendicular unit vectors)
a⋅b∣a∣∣b∣\frac{\mathbf{a} \cdot \mathbf{b}}{|\mathbf{a}||\mathbf{b}|}∣a∣∣b∣a⋅b
a⋅b=b⋅a\mathbf{a} \cdot \mathbf{b} = \mathbf{b} \cdot \mathbf{a}a⋅b=b⋅a
a⋅b+a⋅c\mathbf{a} \cdot \mathbf{b} + \mathbf{a} \cdot \mathbf{c}a⋅b+a⋅c
Subtract acute angle from 180°
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