Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 74
) The dodecahedron,bounded by twelve regular pentagons. (5) The icosahedron, bounded by twenty equilateral triangles. 49. Development. If the surface of a given solid can be flattened out on a plane without distortion, that siu-face is said H od /K bV A a^ ke ^ .>i^ h ^^ d \\/ V Fig. 54 V, § 49]… … 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.
Geometry, Descriptive
Internet Archive · Cornell University Library · Public Domain Mark 1.0. Free to use for anything.
