Why is the dot product a projection (almost)? A visual proof for intuition

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Why would multiplying vector components together and then summing those products give you the length of a projection? There are plenty of ways to prove it, but this proof was what finally satisfied me enough to move on and (mostly) stop dwelling on it.

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Wow... Beautiful proof. Very satisfying.

ceticobr
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This video made me understand 3Blue1Brown's video about dot products. Thank you so much! His explanation is beautiful, but a kind of hand wavy, don't you agree?

ceticobr