Young, George, jr, Baxter, Hubert Eugene, joint author · New York, Macmillan · leaf 117
are known and whose plane is given. 98 DESCRIPTIVE GEOMETRY [VI. § 91 When it was required to find the true length and slope of aline (§ 24) the method consisted in reducing the line to a specialcase. Here also the most natural method will be to bring thegiven figure parallel to, or into… … Fig. 99 on this plane as representing a plane figure, which it is requiredto rotate into a position parallel to, or into coincidence with,H. The purpose of the operation is to determine the trueshape of the imagined figure; hence the relative positions ofthe points must not be changed during the…
Geometry, Descriptive
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