1. Irregular Quadrilateral an irregular quadrilateral is one where the sides are unequal or the angles are unequal OR BOTH Irregular Quadrilateral Google.com Irregular Quadrilateral Aaamath.com Irregular Quadrilateral Google.com

2. Parallelogram A quadrilateral with both pairs of opposite sides parallel. Parallelogram Google.com Parallelogram Mathisfun.com Parallelogram Aaamath.com

3. Rhombus A four-sided shape where all sides have equal length. Rhombus Aaamath.com Rhombus Google.com Rhombus Mathisfun.com

4. Square All four sides are equal Square Google.com Square Aaamath.com Square Mathisfun.com

5. Rectangle a parallelogram having four right angles. Rectangle Aaamath.com Rectangle Google.com Rectangle Mathisfun. com

6. Trapezoid a quadrilateral plane figure having two parallel and two nonparallel sides. Trapezoid Google.com Trapezoid Aaamath.com Trapezoid Mathisfun.com