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 71
thoughtnot necessary to introduce in form. b Fig. 95. 130.—Definition. If a straight line, as a h, {Fig. 95,) stand upon another straight line, as c d, so that the two angles made at 8 68 PRACTICAL GEOMETRY. the point, 6, are equal—a b do a b d, (see note to Art. 27,) theneach of the two angles is… … Fig. 96. 132.—Definition. The measure of an angle is the number ofdegrees contained between its two sides, using the angular pointas a centre upon which to describe the arc. Thus the arc, c e,{Fig. 96,) is the measure of the angle, c b e ; e a, of the angle,e b a ; and a d, of the angle, ab d.…
Carpentry · Architecture
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