Basic math book that contains something about barycenters

[theoristo]

we did something about the basic calculations of barycenter in high school ,I don't remeber it ,I think it's in affine geomtery?does anyone know of any book that has it?my precalculus books don't talk about it

 

[Daverz]

https://www.amazon.com/dp/B00EYVP9J8/?tag=pfamazon01-20

You can read about half the first chapter there.