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### 22 Cards in this Set

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 polygon the union of three or more coplanar segments in which exactly two segments intersect at each endpoint sides segments of a polygon vertices endpoints of the segments tri 3 quad 4 penta 5 hexa 6 hepta 7 octa 8 nona 9 deca 10 undeca 11 dodeca 12 how many sides does a hexagon have? 5 how many angles are there inside a nonagon? 9 what is a polygon with twelve sides called? dodecagon concave has at least one diagonal that lies outside the polygon convex all diagonals inside the polygon theorem 5.1 180[n-2]= sum of interior angles of a convex polygon theorem 5.2 the sum of the measures of the exterior angles, one at each vertex, for any convex polygon is 360 degrees theorem 5.3 every interior angle of a regular n-gon measures (180[n-2])/n theorem 5.4 every exterior angle of a regular n-gon measures 360/n