Polygonal Constructions, Continued
five or more
Using a protractor to construct multisided polygonal figures requires you to
mathematically compute the common angle using a formula. The formula
divides the 360° of a circle by how ever many sides the polygon requires.
For example, a heptagon or seven-sided polygonal figure requires a common
angle of 51.3° (360° ÷ 7 = 51.3°).
Figure 2-44 shows a nine-sided (360° ÷ 9 = 40°) polygon.
Figure 2-44.A nongon.