Lesson VIDEO: Polygon Angle Sum
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*[youtube yV5K2TO8VrM] In this video lesson I discuss the sum of angles of polygons. There is a formula for this sum of angles that depends only on the number of sides of the polygon: if it has n sides, the sum of the angles is 180(n-2). We use this fact to find missing angles in several examples, and to find the interior angles of regular polygons, where each angle is equal. For more details, see the lesson.
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