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 72
b c, {Fig. 96,) aretogether equal to two right angles, {Art. 130, 133 ;) also, thethree angles, a b d,e b a and c 6 e, are together equal to two rightangles. 138.—Corollary. Hence all the angles that can be made uponone side of a line, meeting in a point in that line, are togetherequal to two right…
Carpentry · Architecture
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