The normal elementary geometry : embracing a brief treatise on mensuration and trigonometry : designed for academies, seminaries, high schools, normal schools, and advanced classes in common schools (1884)
Brooks, Edward, 1831-1912 · Philadelphia : Christopher Sower Co. · leaf 128
assplanes perpendicularto the produced edges,forming the parallelo-pipedon EFGH-H.This parallelopipedon, regarding EEHH as the base andEF the altitude,-is a right prism, and is equivalent to theoblique parallelopipedon ABCD —A (Th. IV.). Again, from E and H let fall the perpendiculars EKand HN to… … 124 GEOMETEY. Thus, the rectangular parallelopipedon KLMN—H isequivalent to the oblique parallelopipedon EFFE — H(Th. TV); but this parallelopipedon EFFE — H, which,with EEHH as a base, is a right parallelopipedon, is equiv-alent to the parallelopipedon ABCD — jy (Th. IV.) ; hence,ABCD—If is…
Geometry · Plane trigonometry
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