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 129
, of thisplane with the plane BH is the diag- Monal of the parallelogram KLMN,and divides the parallelogram intotwo equal triangles, LMN and KLN. The oblique prismABD — His equivalent to a right prism whose base is thetriangle KLN and whose altitude is AE (Th. IV.) ; and theoblique prism BCD — H is… … BOOK VI. 125 ^ THEOREM VII. The opposite faces of a parallelopipedon are equal and parallel.TietABGD—H be a parallelopipedon; then will its op-posite faces be equal and parallel. IP XT For, the bases are equal and paral-lel, by the definition of a parallelo-pipedon. Also, BG is equal and pa-rallel…
Geometry · Plane trigonometry
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