1. Polygons
What? Closed figure; 3 or more line segments that do not cross
Name a Polygon Count the number of sides
3 - Triangle
4 - Quadrilateral
5 - Pentagon
6 - Hexagon
7 - Heptagon
8 - Octagon
9 - Nonagon
10 - Decagon
Regular Polygon All sides are congruent; All angles are congruent
Irregular Polygon Sides different lengths; Angles different degrees

2. Two Pairs of Parallel Lines Trapezoid One Pair of Parallel Lines
Quadrilaterals
Polygon with 4 sides
Parallelogram
Two Pairs of Parallel Lines
Trapezoid
One Pair of Parallel Lines
Rectangle
Four Right Angles
Rhombus
Four Congruent Sides
Square
Four Congruent Sides
Four Right Angles