Plane and solid geometry . Fig. 1. Cylindrical Surface Fig. 2. Cylinder 820. Defs. By referrmg to §§ 693 and G9-4, the studentmay give the definitions of generatrix, directrix, and element ofa cylindrical surface. Point these out in the figure. The student should note that by changing the directrix froma broken line to a curved line, a prismatic surface becomes acylindrical surface. 821. Def. A cylinder is a solid closed figure whose boun-dary consists of a cylindrical surface and two parallel planescutting the generatrix in each of its positions, as DC. 383 384 SOLID GEOMETRY 822. Defs. The t
Plane and solid geometry . Fig. 1. Cylindrical Surface Fig. 2. Cylinder 820. Defs. By referrmg to §§ 693 and G9-4, the studentmay give the definitions of generatrix, directrix, and element ofa cylindrical surface. Point these out in the figure. The student should note that by changing the directrix froma broken line to a curved line, a prismatic surface becomes acylindrical surface. 821. Def. A cylinder is a solid closed figure whose boun-dary consists of a cylindrical surface and two parallel planescutting the generatrix in each of its positions, as DC. 383 384 SOLID GEOMETRY 822. Defs. The two parallel plane sections are called thebases of the cylinder, as AC and DF (Fig. 4) ; the portion ofthe cylindrical surface between the bases is the lateral surfaceof the cylinder; and the portion of an element of the cylin-drical surface included between the bases is an element ofthe cylinder, as MN. 823. Def. A right cylinder is a cylinder whose elements areperpendicular to the bases.
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectgeometr, bookyear1912
