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 72
he side, a c, equal to the side, df; then the third side ofone, b c, is equal to the third side of the other, ef; the angle at bis equal to the angle at e, and the angle at c is equal to the angleat/. For, if one triangle be applied to the other, the three points,b, a, c, coinciding with the three… … 142.—Proposition. The two angles at the base of an isocelestriangle are equal. Let ab c, {Fig. 100,) be an isoceles triangle,of which the sides, a b and a c, are equal. Bisect the angle, {Art, 56 AMERICAN HOUSE-CARPENTER. 77,) b a Cjhy the line, a d. Then the line, b a, being equal tothe line, a c…
Carpentry · Architecture
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