Do what the cat says.
2 Sides = Line 3 Sides = Triangle 4 Sides = Square 5 Sides = Pentagon 6 Sides = Hexagon 7 Sides = Heptgon 8 Sides = Octogon 9 Sides = Nonagon 10 Sides = Decagon 12 Sides = Dodecagon 15 Sides = Pentadecagon 20 Sides = Icosagon 360 Sides or more = Circle
