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The American house-carpenter; a treatise upon architecture, cornices and mouldings, framing, doors, windows, and stairs. Together with the most important principles of practical geometry (1852)

Hatfield, R. G. (Robert Griffith), 1815-1879 · New York : J. Wiley · leaf 70

An illustration from The American house-carpenter; a treatise upon architecture, cornices and mouldings, framing, doors, windows, and stairs. Together with the most important principles of practical geometry, 1852, leaf 70
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, &c. 134.—Definition. In measuring an angle, (Art. 132,) no… … •135.—Axiom. If two straight lines, parallel to one another, 54 AMERICAN HOUSE-CARPENTER. as a b and c d, (Fig. 97,) stand upon another straight line, as e/,the angles, a b /and c d /, are equal; and the angle, a b e, isequal to the angle, c d e. 136.—Definition. If a straight line, as a 6, (Fig-.…

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