. Winslow's Comprehensive mathematics : being an extensive cabinet of numerical, arithmetical, and mathematical facts, tables, data, formulas, and practical . ter to the periphery, asC D, and the chord of the arc, D A, will be oneside of the polygon required nearly. Let a pentagon be required, See Fig. To circumscribe a Regular Polygon of anygiven number of sides, about a given circle. Divide the given circle into as many equalparts as the polygon is to have sides, and de-fine the points of division on the circle ; thendraw lines from the centre, o, to each of therespective points, as
. Winslow's Comprehensive mathematics : being an extensive cabinet of numerical, arithmetical, and mathematical facts, tables, data, formulas, and practical . ter to the periphery, asC D, and the chord of the arc, D A, will be oneside of the polygon required nearly. Let a pentagon be required, See Fig. To circumscribe a Regular Polygon of anygiven number of sides, about a given circle. Divide the given circle into as many equalparts as the polygon is to have sides, and de-fine the points of division on the circle ; thendraw lines from the centre, o, to each of therespective points, as o a, o b, &c. Throughthese points, and at a right angle to the lineleading from the centre thereto, draw thelines A B, B G, &c, which will complete the figure. Let it be required to circumscribe with a pentagon ; — see Fig. To construct a square whose area shall be that of a given A B C be the given B let fall the perpendicular B a;make A b equal to half B a; bisect b C, andfrom the point of bisection as a centre, de-scribe the semicircle bdC : erect, the perpen-dicular, A d, which will be the side of thesquare required. 16.
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