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 210
lique prism, of which abcde andfghil are right sections, and gh — OB-^ then is lb equiva-lent to LB. For the truncated prisms 10 and eB have thefaces including any triedral, as C and B, equal and simi-larly placed (?), whence these prisms are equal {466).Now, from the whole figure, take away prism… … PROPOSITION IT. ■The opposite faces of a parallelopiped are 470, Theorem. equal and parallel. Dem.—Let. Ac be a parallelopiped, AC and ac beingits equal bases (462); then are its opposite faces equal and parallel. Since the bases are parallelograms, AB is equal andparallel to DC ; and, since the…
Geometry · Trigonometry
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