The American house carpenter. A treatise on the art of building. Comprising styles of architecture, strength of materials, and the theory and practice of the construction of floors, framed girders, roof trusses, rolled-iron beams, tubular-iron girders, cast-iron girders, stairs, doors, windows, mouldings, and cornices; together with a compend of mathematics. A manual for the practical use of architects, carpenters, stair-builders, and others (1880)
Hatfield, R. G. (Robert Griffith), 1815-1879, Hatfield, O. P., ed · New York, J. Wiley & sons · leaf 489
ri-angles, one of which is the trmngleBDC; therefore thearea of the triangle ABC equals three times the area of thetriangle BBC; or, when A represents the area— 446 POLYGONS. 3^ 4 Vi (•33-) Or: The area of a regular trigon or equilateral triangleequals tJiree fourtJis of the square of a side of the… … Fig. 288. circles, of which ^ ^ is the radius of the former and E F ihditof the latter. The point F bisects A B, the side of thesquare. A /^equals FF and equals half A B, a side of thesquare. Putting R for the radius of the circumscribedcircle and b for A B, we have {Art. 416)— AE^^ = AF^-\-EF\…
Carpentry · Architecture · Building
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