Answer:
me Sides Shape Interior Angle
Triangle (or Trigon) 3 regular triangle 60°
Quadrilateral (or Tetragon) 4 regular quadrilateral 90°
Pentagon 5 pentagon regular 108°
Hexagon 6 hexagon regular 120°
Heptagon (or Septagon) 7 heptagon refular 128.571°
Octagon 8 octagon regular 135°
Nonagon (or Enneagon) 9 nonagon regular 140°
Decagon 10 regular decagon 144°
Hendecagon (or Undecagon) 11 regular hendecagon 147.273°
Dodecagon 12 regular dodecagon 150°
Triskaidecagon 13 152.308°
Tetrakaidecagon 14 154.286°
Pentadecagon 15 156°
Hexakaidecagon 16 157.5°
Heptadecagon 17 158.824°
Octakaidecagon 18 160°
Enneadecagon 19 161.053°
Icosagon 20 162°
Triacontagon 30 168°
Tetracontagon 40 171°
Pentacontagon 50 172.8°
Hexacontagon 60 174°
Heptacontagon 70 174.857°
Octacontagon 80 175.5°
Enneacontagon 90 176°
Hectagon 100 176.4°
Chiliagon 1,000 179.64°
Myriagon 10,000 179.964°
Megagon 1,000,000 ~180°
Googolgon 10100 ~180°
n-gon n regular n gon (n−2) × 180° / n
