1. Quadrilaterals
By Dara L. Iwankovitsch

2. What is a Quadrilateral?
A four sided figure
Because it has four sides, a quadrilateral also has four angles
The angles will all add up to 360°
There are five most well known types of quadrilaterals. They are:
Rhombus
Parallelogram
Rectangle
Square
Trapezoid

3. What is a Rhombus?
Has four equal sides
Sometimes called a diamond

4. What is a Parallelogram?
Has two sets of parallel sides
Opposite sides are parallel and equal
Opposite angles are equal

5. What is a Rectangle? Rectangles are special parallelograms
Two sets of parallel sides
Opposite sides are parallel and equal
All angles are equal
Each angle is 90°

6. What is a Square? A square is a special rectangle All angles are equal
Opposite sides are parallel
All angles are equal
Each angle is 90°
All sides are equal

7. What is a Trapezoid?
One set of parallel sides

8. Additional Online Resources
Math.com : Quadrilaterals
This site will tell you some more surface and in depth information about quadrilaterals. Start with the “First Glance” step and progress through the rest of the steps. The information in Examples and Workout require a little more in depth thinking.
Primary Resources: Shape Reveal
To use this site please click on the “Shape Reveal” Link in the list of online activities. From there you may select either the “quadrilaterals” or the “quadrilaterals with rotation” option. Hit the arrow button to begin. You will see different types of quadrilaterals.

9. Additional PDF Resources
Quadrilateral Worksheet
Answers to Quadrilateral Worksheet