Page:First six books of the elements of Euclid 1847 Byrne.djvu/41

Rh N the ame bae, and on the ame ide of it there cannot be two triangles having their conterminous ides ( and ,  and ) at both extremities of the bae, equal to each other.

When two triangles tand on the same bae, and on the ame ide of it, the vertex of the one hall either fall outide of the other triangle, or within it; or, latly, on one of its ides. If it be poible let the two triangles be contructed o that, then therefore the two triangles cannot have their conterminous ides equal at both extremities of the bae.

Q.E.D.