Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 76
with o^z will give V, § 51] PLANE FIGURES AND SOLIDS 59 the point o- Now if the line is swung back to its correctposition, o will trace a horizontal line, and o will be on thisline and directly above o*. Having determined o, connect itwith a, c, and 6. The projections of the tetrahedron are… … Fig. 59 general method for this problem is to work from the knownconverse solution. (See § 29.) In this case the developmentof one half of the solid (consisting of six pentagons) will be asshown by the dotted lines in Fig. 59. The outside figures willbe rotated about the lines joining them to the…
Geometry, Descriptive
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