QUADRILATERAL Four sides PARALLELOGRAM Four sides - two pairs parallel EQUILATERAL All sides congruent EQUIANGULAR All angles congruent DODECAGON Twelve sides ISOSCELES Triangle with two congruent sides TRAPEZOID Four sides - one pair parallel UNDECAGON Eleven sides TRIANGLE Three sides PENTAGON Five sides HEPTAGON Seven sides HEXAGON Six sides OCTAGON Eight sides NONAGON Nine sides DECAGON Ten sides RHOMBUS Equilateral quadrilateral SCALENE Triangle with no sides congruent REGULAR Convex, equilateral, and equiangular CONVEX All angles less than 180 degrees SQUARE Rectangular rhombus
