Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 74
Fig. 55 In Fig. 54, for example, the plan and elevation of a squarepyramid are shown. To develop the surface, let each of thesloping faces be rotated outward, until they fall in the plane ofthe base. The figure a/e — d/f is the required development. … Fig. 56 Fig. 57 If the pyramid is placed with one of its triangular faces onthe plane of development, and then is rolled over so that eachface in turn is brought into this plane, the development appearsas in Fig. 55. Figures 56 and 57 show the developments of anoctahedron and an icosahedron,…
Geometry, Descriptive
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