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re
vector projections (2d)
author
Andrew Lorimer
<andrew@lorimer.id.au>
Wed, 17 Oct 2018 23:10:21 +0000
(10:10 +1100)
committer
Andrew Lorimer
<andrew@lorimer.id.au>
Wed, 17 Oct 2018 23:10:21 +0000
(10:10 +1100)
spec/vectors.md
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b/spec/vectors.md
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spec/vectors.md
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spec/vectors.md
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If $\vec{a} \cdot \vec{b} = 0$, then $\vec{a} \perp \vec{b}$ (since $\cos 90 = 0
## Finding angle between vectors
$$\cos \theta = {{\vec{a} \cdot \vec{b}} \over {|\vec{a}| |\vec{b}|}} = {{a_1 b_1 + a_2 b_2} \over {|\vec{a}| |\vec{b}|}}$$
+
+
+## Vector projections
+