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The American house carpenter: a treatise upon architecture, cornices and mouldings, framing, doors, windows and stairs. Together with the most important principles of practical geometry (1852)

Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 74

An illustration from The American house carpenter: a treatise upon architecture, cornices and mouldings, framing, doors, windows and stairs. Together with the most important principles of practical geometry, 1852, leaf 74
, draw h «, parallel to b d. In every paral-lelogram thus divided, the parallelogram, J, is equal to the paral-lelogram, B. According to xirt. 143, the triangle, a 6 c, isequal to the triangle, bed; the triangle, C, to the triangle, D ;and E to F ; this being the case, take D and F from the… … Fig. 103. 145.—Proposition. Parallelograms standing upon the samebase and between the same parallels, are equal. Let ah c d andef cd^ {Fig. 1()3,) be given parallelograms, standing upon thesame base, c d, and between the same parallels, a f and c d.Then, ah and e/being equal to c c/, are equal to…

Carpentry · Architecture

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