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
,) are rightangles, and as the semi-circle, cad, contains 180 degrees, {Art.131,) the measure of two right angles, therefore, is 180 degrees ;of one right angle, 90 degrees ; of half a right angle, 45; ofone-third of a right angle, 30, ifec. 134.—Defiadtion. In measuring an angle, {Art. 132,) no… … 135.—Axiom. If two straight lines, parallel to one another, AMERICAN HOUSE-CARPENTER. 59 3ls a b and c d, {Fig. 97,) stand upon another straight line, as ef,the angles, a bf and c d f^ are equal; and the angle, a 6 e, isequal to the angle, c d e. 136.—Definition, If a straight line, as a 6, [Fig.…
Carpentry · Architecture
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