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Chapter 1-6 (Classify Polygons) What is a polygon? A closed plane figure formed by 3 or more line segments, with no two sides being collinear. Chapter 1-6 (Classify Polygons) Two types of polygons Convex: All vertices going outward Concave: A vertex going inside the polygon Chapter 1-6 (Classify Polygons) Example Tell whether the following polygons are convex or concave Chapter 1-6 (Classify Polygons) How do you classify polygons? Named by the number of sides After 12 sides, the general name is a n-gon, where n is the number of sides Congruent polygons: Equilateral: All sides are congruent Equiangular: All angles are congruent Regular: Convex polygon that is both Chapter 1-6 (Classify Polygons) Example Classify the polygons by the number of sides. Is it equilateral, equiangular, or regular? Chapter 1-6 (Classify Polygons) Example Chapter 1-6 (Classify Polygons) Example The expression (4x + 8)º and (5x – 5)º represent the measures of 2 of the congruent angles in the previous problem. Find the measure the an angle.