1. Classifying Quadrilaterals
Andrea Green

2. Define Quadrilateral Let's first examine the word:
Quad – meaning four (4).
Lateral – meaning side or sides.
Quadrilateral – Any shape with 4 sides.

3. Classifying Quadrilaterals
There are six (6) main classifications or types:
Rectangle Rhombus
Square Trapezoid
Parallelogram Kite

4. Helpful Hints Tick marks indicate which sides are equal. For example:
Side A and C are equal because they both have 2 tick marks.
Side B and D are equal because they both have 1 tick mark
Tick mark side D
Tick mark side A
Tick mark side C
Tick mark side B

5. Helpful Hints Remember: The right angle
When you see this symbol, inside a shape, it indicates a right angle. For example
**Right angles measure 90 degrees
This indicates a right angle.

6. Helpful Hints
Arrowheads > indicate parallel lines. For example: Lines A and B are Parallel
Double arrowheads >> indicate equal parallel lines. For example: A B C
Lines C and D are Parallel and equal D

7. Lets Begin Classifying (naming)
Rectangle Has:
4 sides
4 right angles
Opposite sides are equal

8. Classifying/Naming
Square has:
4 sides
4 right angles
4 equal sides

9. Classifying/Naming Parallelogram has: 4 sides 2 pair of parallel sides
2 pair of opposite equal sides
Note: Parallelograms are very similar to rectangles. However, parallelograms DO NOT have right angles. Imagine rectangle with a slant.

10. Classifying/Naming Rhombus has: 4 sides 4 equal parallel sides
Note: The Rhombus is very similar to the square. However, there are NO right angles in a Rhombus. Think of it as a square pushed over.

11. Classifying/Naming Trapezoid has: 4 sides 2 of the sides are parallel
Parallel sides are NOT equal
Note: Parallel lines DO NOT intersect.

12. Classifying/Naming Kite has: 4 sides 2 pairs of adjacent sides
The adjacent sides are equal

13. Quick Reference Attribution 2.0 Generic (CC BY 2.0)
Classifying Quadrilaterals v1.1
Picture by: mathexmusic
Attribution 2.0 Generic (CC BY 2.0)