Polygons

1. Parallelograms

1.1. 2 pairs of parallel sides

1.1.1. Rhombus

1.1.1.1. 4 equal sides

1.1.2. Square

1.1.2.1. 4 equal sides AND 4 right angles

1.1.3. Rectangle

1.1.3.1. 4 right angles

2. Triangles

2.1. Right triangles

2.1.1. one angle is 90 degrees

2.2. Other triangles

3. Other shapes

4. Quadrilaterals

4.1. Trapezoids

4.1.1. 1 Pair of parallel sides

4.2. Other quadrilaterals