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##### The Polygon Angle Sum Theorems

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**Polygon**• A polygon is a plane closed figure with at least three sides. The sides intersect only at their endpoints, and no adjacent sides are collinear.**Naming a Polygon**• When naming a polygon, you name the vertices in order.**Convex vs. Concave**• Diagonal – a line segment connecting two vertices of a polygon • Convex Polygon – has no diagonal with points outside the polygon • Concave Polygon – has at least one diagonal with points outside of the polygon