An elementary treatise on geometry : simplified for beginners not versed in algebra (1833)
Grund, Francis J. (Francis Joseph), 1805-1863 · Boston : Carter, Hendee & Co. · leaf 35
tion of a third line, is equal to two rightangles. 30 GEOMETRY. QUERY IX. Suj)posing the tioo straight lines CD, EF, are cut bya third line AM at unequal angles, ABC, BHE (Fig. 1.and II.); or so as to have the alternate angles CBH andBHF, or DBH and BHE unequal; or in such a man-ner, that the sum… … A. They will, in every one of these cases, cut eachother, if suficiently extended. Q. How can you prove this ? A. By drawing, through the point B, another line NPat equal angles with EF, and which will then also makethe alternate angles, NBH, BHF and PBH, BHE, equal,and the sum of the two interior…
Geometry, Plane
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