Theorem 1. a If two straight lines meet a third line, making the sum of the interior angles, on the same side of the line met, equal to ttco right angles, the two lines will be parallel. For the proof, see Legcndrca#39;s Geometry. Tueohem 2. a If twoanbsp;...
Title | : | The Massachusetts Teacher and Journal of Home and School Education |
Author | : | |
Publisher | : | - 1857 |
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