Proposition 26

"Proposition 26," collage, acrylic paint, ink, 8" x 8", © 2013 Wendy Tribulski

“Proposition 26,” collage, acrylic paint, ink, 8″ x 8″, © 2013 Wendy Tribulski

 

Congruence –  two triangles are congruent if they 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 subtending one of the equal angles.”   The proof doesn’t have any truck with applying one triangle to the other and seeing if they’re the same size.  It just keeps proving that each piece of one triangle must be equal to a corresponding piece of the other.

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