Young, George, jr, Baxter, Hubert Eugene, joint author · New York, The Macmillan Co. · leaf 194
ay be computed by proportion. Let the student prove that the angle of the sector given bydeveloping a right circular cone is equal to 360° cos a, wherea is the angle of inclination of an element of the cone to thebase. II. Oblique Cone. Between any two elements, drawn neartogether (as oa, oh, Fig.… … Fig. 170 178 DESCRIPTIVE GEOMETRY [VIII, § 157 approximation, depending on the care and the number ofelements used. III. Lines on the Stjrface. Any line on the surface ofa cone can be shown on the development by finding the truelengths of the intersected elements and transferring these tothe…
Geometry, Descriptive
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