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 77
two right angles ;since the angles, A and jB, are equal to B and C, take the sameamount, the angle, 5, from each pair, and what remains of onepair is equal to what remains of the other; therefore, the an-gle, A, is equal to the angle, C. The same can be proved ofthe opposite angles, B and D.… … drawn parallel tob e. As g c is parallel to e 6, the angle, g c d^is, equal, {Art. 135,) to the angle, e hd; as the lines,/c and h e,cut one another at a, the opposite angles, f a e and b a c, areequal, {Art. 148 ;) as the angle,/a e, is equal, {Art. 135,) to theangle, acg, the angle, a c ^, is…
Carpentry · Architecture
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