Hatfield, Robert Griffith, 1815-1879. [from old catalog] · New York & London, Wiley and Putnam · leaf 43
Fig. 51. 91.—About a given circle^ to describe an equi-lateral tri-angle. Let a d b c, {Fig. 5],) be the given circle. Draw thediameter, c d ; upon d, with the radius of the given circle, de-scribe the arc, a e b ; join a and b ; drsiwfg, at right angles tod c ; make/c and c g, each equal to a b ;… … 92.—To find a right line nearly equal to the circumferenceof a circle. Let abed, {Fig. 52,) be the given circle. Drawthe diameter, a c ; on this erect an equi-lateral triangle, a e c,according to Art. 96 ; draw gf, parallel to a c ; extend e c to/,also e ato g ; then g f will be nearly the length…
Carpentry · Architecture
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