Euclid Book 1 - Proposition 26
Congruent triangles if two sides and corresponding angle are equal

Index --- introduction --- definitions --- axioms and postulates --- propositions --- other

To be proved: If two triangles have two angles equal to two angles respectively, and one side equal to one side, namely, either the side adjoining the equal angles, or that opposite one of the equal angles, then the remaining sides equal the remaining sides and the remaining angle equals the remaining angle.

Step through proof by clicking on Next line:

There are two triangles ABC and DEF where angles ABC = DEF and BCA = EFD, and line BC = EF

Previous proposition - Next proposition

© Jo Edkins 2010 - Return to Euclid index