This is something that has been bothering me...(adsbygoogle = window.adsbygoogle || []).push({});

Given two vectorsAandB

Is there a way to prove thatAdotB= ABcosθ ?

I'm concerned with WHY this is the case... If anyone has a good proof that would be great.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Proof for dot products

**Physics Forums | Science Articles, Homework Help, Discussion**