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Euclid: Elementa

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Click to Expand/Collapse OptionTitle
Click to Expand/Collapse OptionPreface
Click to Expand/Collapse OptionBook I
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DEFINITIONS II. 
 
 
1. Given a rational straight line and a binomial, divided into its terms, such that the square on the greater term is greater than the square on the lesser by the square on a straight line commensurable in length with the greater, then, if the greater term be commensurable in length with the rational straight line set out, let the whole be called a first binomial straight line; 
 
 
2. but if the lesser term be commensurable in length with the rational straight line set out, let the whole be called a second binomial; 
 
 
3. and if neither of the terms be commensurable in length with the rational straight line set out, let the whole be called a third binomial. 
 
 
4. Again, if the square on the greater term be greater than the square on the lesser by the square on a straight line incommensurable in length with the greater, then, if the greater term be commensurable in length with the rational straight line set out, let the whole be called a fourth binomial; 
 
 
5. if the lesser, a fifth binomial; 
 
 
6. and if neither, a sixth binomial. 
 
 
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