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Scientific American, Vol. 34, No. 14 (April 1876) (1876)

leaf 5

An illustration from Scientific American, Vol. 34, No. 14 (April 1876), 1876, leaf 5
figures. With the same radius, on A as a center, cut thecircle in C and D. Draw C D, and produce it to B, makingC E, equal to three times C D. Divide C E into as many equal … parts as the required polygon has sides. Draw B T, cuttingC E, in the first point of section and touching the circle inF. Draw C F, which is the side required. Fig. 1 shows the side of a square; Fig. 2 the side of apentagon; Fig. 3 a triangle and a hexagon. It will be notedthat, in the triangle, C…

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