The American house-carpenter; a treatise on the art of building, and the strength of materials (1867)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York, J. Wiley · leaf 75
, draw h i, parallel to b d. In every paral-lelogram thus divided, the parallelogram, A, is equal to the paral-lelogram, B. According to Art. 143, the triangle, a 6 c, isequal to the triangle, bed; the triangle, Cj to the triangle, D ;and E to F ; this being the case, take D and F from the… … Fig.101 145.—Proposition. Parallelograms standing upon the samebase and between the same parallels, are equal. Let abed andefcd, {Fig. 103,) be given parallelograms, standing upon thesame base, c d, and between the same parallels, a f and c d.Then, ab and e/being equal to c d, are equal to one…
Carpentry · Architecture
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