Worthen, William Ezra, 1819-1897, [from old catalog] ed · New York, Appleton · leaf 37
Fig. 71. Fig. 72. opposite sides at A and B, draw A B, and bisect it at C by D E drawn betweenopposite angles; with the radius 0 A describe the circle as required. When the number of sides is odd, as in Fig. 72, bisect two of the sides at Aand B, and draw lines A E, B D, to the opposite angles,…
Mechanical drawing
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