Definition of Terms, ContinuedPolygonsAny plane figure bound by straight sides is a polygon. This definitionincludes triangles and quadrilaterals. Polygons having equal sides and equalangles are called regular polygons (including equilateral triangles andsquares) and can be constructed by inscribing in or circumscribing around acircle or square, a technique covered later in this chapter. The following listshows how the names of the regular polygons change with the number ofsides:SidesName3Triangle4Square5Pentagon6Hexagon7Heptagon8Octagon9Nonagon10Decagon12DodecagonFigure 2-6 shows regular polygons.Figure 2-6.—Regular polygons.Continued on next page2-8

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