OpenStax, Contemporary Mathematics §10.4 Polygons, Perimeter, and Circumference · Example 1 · Geometry · Quadrilaterals & polygons
Polygons, Perimeter, and Circumference · Example 1
Find the measure of an interior angle in a regular octagon using the formula, and then find the sum of all the interior angles using the sum formula.
OpenStax, Contemporary Mathematics · §10.4 Polygons, Perimeter, and Circumference · Example 1
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