Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 71
54 DESCRIPTIVE GEOMETRY [V, § 46 46. Special Case. An adaptation of the principles of § 27enables us to construct the projections of any plane figure, oneside of which is parallel to a plane of projection. I. Let it be required to draw the projections of a regularpentagon one side of which is… … plane of which is inclined at an angle of 30° to H (Fig. 51).In this case, the plane of the figure is perpendicular to P. Hencethe P projection will be a line inclined at an angle of 30° to PA.Let us start the drawing on P, using a P plane opened to theright into H. Any line of indefinite length,…
Geometry, Descriptive
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