Answer:
The mathematician's foundations (Euclid of Alexandria) that can be found in CAD software are the postulates and axioms that are the foundations of the Euclidian geometry. These elements are the collection of definitions, postulates, propositions (theorems and constructions), and mathematical proofs of the propositions.
 
        
                    
             
        
        
        
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Answer:
Flagellation of Christ - Piero della Francesca
V*rg*n of the Rocks -  Leonardo da Vinci
The Peasant Dance - Pieter Bruegel the Elder
Explanation:
All of these are notable works that you can easily find more information on by researching the name of the peice.