PolygonalConstructionIntroductionPolygons are the most common geometric constructions. A thoroughunderstanding of these basic constructions enhances the novice draftsman’sability to draw accurately and to become more familiar with draftinginstruments. Before beginning to draw polygons, you must understand thecircumscribed and inscribed methods of drawing geometric constructions.CircumscribedThe circumscribed method of drawing polygonal constructions is a process bymethodwhich the geometric figure is drawn inside a circle. The circle surrounds anddefines the figure. The measurements for various planes or surfaces of thegeometric figure are drawn across the corners or horizontal diameter of thecircle.Figure 2-32 is a square circumscribed by a circle.Figure 2-32.—A square circumscribed by a circle.Continued on next page2-33
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