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Area of Regular Polygons Tuesday, April 22, 2014 9:42 AM Area of a If a regular polygon has n sides, it can be divided into n Regular Polygon congruent isosceles triangles. One way to find the area of the entire polygon is to multiply the area of one of the isosceles triangles by n. Example: Find the area of a regular decagon with side lengths of 4. 1. Find the measure of the vertex angle find the measure of one interior angle 2. Find the height of one of the triangles using right triangle trigonometry. 3. Find the area of one triangle. 4. Multiply the area of one triangle by n, the number of sides. Ch. 8 Page 1 Ch. 8 Page 2 Ch. 8 Page 3