T H E E L E M E N T S |
Book I Proposition 4 | |
Therefore the base BC will coincide with EF and will be equal to it. [C.N.4] Thus the entire triangle ABC will coincide with the entire triangle DEF, and will be equal to it and the remaining angles coinciding with the remaining angles will be equal to them, ABC to DEF, and ACB to DFE. Being what it was required to prove. |
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