A treatise on special or elementary geometry (1877)
Olney, Edward, 1827-1887, Olney, Edward, 1827-1887. Elements of trigonometry, plane and spherical · New York : Sheldon · leaf 208
y a planeperpendicular to its lateral edges is called a Right Section Ills.—In the figure, (a)and (6) are both prisms:{a) is oblique and (6) right,PO represents the altitudeof (a); and any edge of(ft), as 5B, is its altitude.ABCDEF, and ahcdef, arelower and upper bases,respectively. Either por-tion… … FiG. 28 188 ELEMENTARY SOLID GEOMETRY. ograms. If its faces are all rectangular, it is a rectangular parallel-epiped. 463, A Cube is a rectangular parallelepiped whose faces are allequal squares. PROPOSITION I. 404* Theorem,—Parallel plane sectionsof any prism are equal polygons. Dem.—Let ABCDE and…
Geometry · Trigonometry
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