Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 46
s 1 and2 are the angles which thegiven line makes with H andFrespectively. To prove that1 + 2 cannot exceed 90°. Inthe right triangle aal^, theside aPa! < ab. The righttriangles aa^l^ and ablAhave a conunon hjpotenuse ;hence the one having thegreater base will contain thesmaller angle adjacent… … Fig. 26 30 DESCRIPTIVE GEOMETRY [III, § 27 27. Second Method for Finding True Length. The secondmethod, as well as the first, depends on having the hne parallelto a plane of projection. It differs from the first method, however,in that the plane is brought to the line, rather than the line tothe…
Geometry, Descriptive
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