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 161
will not be changed,since CDE and CHE have thesame base CE, and the samealtitude, as their vertices lie inDH parallel to EC. From thepolygon thus reduced we cutthe triangle FHE, and replaceit by its equivalent FHI, by drawing the diagonal FH, and the parallel El. Inlike manner, by drawing FB and… … AREA. PROPOSITION TI. 320, Theorem,—The area of a rectangle is equal to the productof its base and altitude. Dem.—Let ABCD be a rectangle, then is its area equal to the base AB multi-plied by the altitude AC. If the sides AB and AC are commensurable, takesome unit of length, as E, which is…
Geometry · Trigonometry
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