I. Polygon: Poly- =many, in this case 3 or more; -gon = sides
A. A closed plane figure (2-D) with straight sides that are connected line segments
B. We can use triangles to figure out the amount of total degrees for interior angles – all triangeles= 180 degrees total
C. Decagon: a polygon with ten sides, angles, and vertices
D. n-gon: a polygon with n sides, angles, and vertices
II. Vertex: a point where two sides of a polygon meet
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