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Math Coding In Asteroids Game

Today Ant taught us all about Dot Product.
The mathematics description of dot product:
“The Dot Product gives the cosine of the angle between two vectors times by the length of each vector”
The dot product would look like this when it is written out. (?,?,?) . (?,?,?)
Say the 2 coordinates are
(7,-4,2) and (6,2,0.5)
You must multiply the XYZ values against the other XYZ values
(42,-8,1) 
You then add them 3 numbers together to get the dot product which in this case would be 37.

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