T H E E L E M E N T S	Book I   Proposition 4
	Let the two triangles ABC, DEF have the two sides AB, AC equal to the two sides DE, DF respectively, AB to DE and AC to DF, and the angle BAC equal to the angle EDF. I say that also the base BC will be equal to the base EF, and the triangle ABC will be equal to the triangle DEF, and the remaining angles will be equal to the remaining angles respectively, that is the angle ABC to the angle DEF and the angle ACB to the angle DFE.
	Return to Propositions    Next Page