 
                            
                        
                        
                        
                                        
                                        Interview with Oriana Fallaci (2 December 1979), Corriere della Sera 
Interviews
                                    
            Book I, Chapter III, p.184 
Nicomachus of Gerasa: Introduction to Arithmetic (1926)
        
                                        
                                        Interview with Oriana Fallaci (2 December 1979), Corriere della Sera 
Interviews
                                    
Source: A Mathematical Dictionary: Or; A Compendious Explication of All Mathematical Terms, 1702, p. 2, The introduction
Robert Chambers, Chambers's Information for the People (1875) Vol. 2 https://books.google.com/books?id=vNpTAAAAYAAJ
The Art of Doing Science and Engineering: Learning to Learn (1991)
“In geometry his greatest achievement was an accurate value of π.”
                                        
                                        His rule is stated as: dn^2+(2a-d)n=2s, which implies the approximation 3.1416 which is correct to the last decimal place. 
In, p. 245. 
Encyclopaedia of the History of Science, Technology, and Medicine in Non-Western Cultures
                                    
Introduction to Astronomy and Cosmology (2008), Ch. 1 : Astronomy, an Observational Science
Lectures on Metaphysics and Logic: "6th Lecture on Metaphysics", p. 69, ed. 1871, Boston; partly reported in Austin Allibone ed. Prose Quotations from Socrates to Macaulay. (1903), p. 34
 
                            
                        
                        
                         
                            
                        
                        
                         
                            
                        
                        
                        