Smith, David Eugene, 1860-1944 · Boston, New York [etc.] Ginn and Company · leaf 190
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… … ?/*> 71 •*riitwr>rw/a ■ Z4- J 1 1 Bat Early Methods of LevelingPomodoros La geometria prattica, Rome, 1624 is level. With such simple primitive instruments, easilymade by pupils, a good deal of practical mathematicalwork can be performed. The interesting old illustrationhere given shows how…
Geometry
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