# Orth of b onto a

1. ### darthxepher

58
1. The problem statement, all variables and given/known data

Show that vector orth of b onto a=b-proj of b onto a is orthogonal to a.

I totally don't know where to start :(

and I don't know hat orth of b onto a means...

2. ### CompuChip

4,299
Well, that's kind of crucial for answering this question, isn't it. Do you have any lecture notes or textbook in which you can look this up?
Do you remember what the dot product ($\vec a \cdot \vec b$) meant geometrically?

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