The American house-carpenter; a treatise on the art of building, and the strength of materials (1873)
Hatfield, R. G. (Robert Griffith), 1815-1879 · New York : J. Wiley · leaf 83
PRACTICAL GEOMETRY … Fig. 110. a side of the square from its corner to the more remote angleof the octagon occurring on that side of the square. To provethis, it need only to be shown that the triangle, a o d, (Fig.110,) is an isosceles triangle having its sides a o and a d, equal.The octagon being eqni-lateral, it is…
Carpentry · Architecture
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