Need a Refresher on Math, Geometry, and Formulas for 3D Printing and Freecad?

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Duffy
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Like I mentioned in title...just looking to brush up on all that forgotten stuff from my school years.
I have recently got into freecad as a hobby and also looking to try out 3d printing so I feel some areas of math, geometry and formula need refreshing!
Nice to meet you all.
 
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