Euclid's Elements - Book 8, Proposition 19
Channel: Sandy Bultena
Date: 23/06/2022

Proposition:
If A,B are similar solid numbers, 
A=CDE, B = FGH and 
C:D=F:G and D:E=G:H, then 
A:B is the triplicate ratio of C:F, D:G, E:H, and 
there are two mean numbers between A and B

PDFs:
https://github.com/sandy-bultena/Euclid/tree/master/Propositions/PDFs