Anthony, Gardner Chace, 1856- [from old catalog], Ashley, George Francis, [from old catalog] joint author · Boston, D. C. Heath & co. · leaf 50
JECTIONS OF A POLYGON 33 47. Construction 2. A sometimes shortermethod of counter-revolution, to obtain thevertical projection of the pentagon, is asfollows. Fig. 82. Assume the revolvedposition of the pentagon to have been drawnas described above. From any point of thepentagon, as c\ draw a line… … section with a perpendicular to VN from c(Art. 42, page 30). Produce cV to VN, thusdetermining the line c5, and, therefore, If.Since Va^ is parallel to YN, a^ may be foundby drawing a parallel to VJV from b^ to meetthe perpendicular from a (Art. 35, page22). Likewise d is determined, since ed…
Geometry, Descriptive
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