American text books of art education : Geometrical drawing (1873)
Smith, Walter, 1836-1886 · Boston : James R. Osgood & Co. · leaf 95
/4 … • Proposition.— Triangles having the same, or equal bases, have toeach other the same ratio as their altitudes, or, having the same or equalaltitudes, have to each other the same ratio as their bases. Thus the triangle A B C has only half of the area of A B D andone third of A B E, all being on the…
Geometrical drawing
Internet Archive · Boston Public Library · Public Domain Mark 1.0. Free to use for anything.
