11- undecagon
12- dodecagon
13- 13-gon
14- 14-gon
15- 15-gon
16- 16-gon
17- 17-gon
18- 18-gon
19- 19-gon
20- 20-gon
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ennedagon
pentagon
a quadrilateral, or Tetragon, or Quadrangle
geodesic
regular polygons are the ones that all sides are equal