The American house-carpenter; a treatise on the art of building, and the strength of materials (1873)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York : J. Wiley · leaf 87
he same chord, df, are equal. Theangles G and A being right angles, (Art. 156,) are likewiseequal. Now, since A equals (7, and B equals D, thereforethe sum of A and B equals the sum of C and D—or the anglea cf equals the angle c nf. 164.—Proposition. Two chords, a 5 and c d, (Fig.… … Fig. 116. equal to the product of a e multiplied by e 5. The triangle Ais similar to the triangle B, because it has corresponding an-gles. The angle i equals the angle e, (Art. 148 ;) the angle atc equals the angle at a because they stand upon the samechord, d 5, (Art. 161;) for the same reason the…
Carpentry · Architecture
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