Definition of Terms, Continued
Polygons
Any plane figure bound by straight sides is a polygon. This definition
includes triangles and quadrilaterals. Polygons having equal sides and equal
angles are called regular polygons (including equilateral triangles and
squares) and can be constructed by inscribing in or circumscribing around a
circle or square, a technique covered later in this chapter. The following list
shows how the names of the regular polygons change with the number of
sides:
Sides
Name
3
Triangle
4
Square
5
Pentagon
6
Hexagon
7
Heptagon
8
Octagon
9
Nonagon
10
Decagon
12
Dodecagon
Figure 2-6 shows regular polygons.
Figure 2-6.—Regular polygons.
Continued on next page
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