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Dot Product Confusion

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It's my understand that given two vectors (A & B ) the dot product should be equal to the magnitude of the project of A onto B...

However in this example (and any other I can find):


The dot product is double what I would expect it to be. The magnitude of the projection of A onto B (yellow line) in this example is 0.5, but its reported as 1

What am I missing? Edited by Jcoose

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