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 75
Fig. 104. lels, a d and h e, they are therefore equal, {^Art. 145, 146 ;) andsince the triangle, C, is common to both, the remaining triangles, Aand 5, are therefore equal; then B being equal to yl, the triangle,a e c, is equal to the quadrangle, a h c d. … Fig. 105. 148.—Proposition. If two straight lines cut each other, asa h and c c?, {Fig. 10.5,) the vertical, or opposite angles, A andC, are equal. Thus, a e, standing upon c d., forms the angles,jBand C, which together amount, {Art. 137,) to two right angles ;in the same manner, the angles, A and…
Carpentry · Architecture
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