Smith, David Eugene, 1860-1944 · Boston, New York [etc.] Ginn and Company · leaf 189
BOOK I AXI) ITS PROPOSITIONS 179 If the plumb line passes through the mid-point of the base,the two triangles are congruent and the plumb line isthen perpendicular to the base. In other words, the base 7 .* i ■■Camtjt Mm&ti&ole QBiqw1x£,Perpen<&colat]\ifBasede Monti- SwiSmertte…
Geometry
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