Where do we see this family?
Mom:
Definition: a plane
figure having four sides and four angles
We see quadrilaterals everywhere.
They are the main category and each of the following shapes are their children:
Dad:
Definition: A plane figure with four
sides, in which the opposite sides are parallel and of
equal length.
Definition: A plane figure with all the
same properties as a parallelogram, plus it's diagonals are perpendicular
and all sides are equal.
| Quadrilateral |
We see quadrilaterals everywhere.
They are the main category and each of the following shapes are their children:
 This building is a parallelogram |
 These paintings represent a rhombus |
 This pool is a rectangle |
 |
 |
Dad:
| Parallelogram |
- A parallelogram consists of three other quadrilaterals!
- A rhombus
- A rectangle
- A square
- These three quadrilaterals also fall under the parallelogram category, in other words they have the same properties and a few extra of their own!
- Here are a few of the extra
properties that each one holds:
| Rhombus |
Sister:
Definition: A
plane figure with all the same properties as a parallelogram, plus it's
diagonals
are equal and the sides are perpendicular.
| Rectangle |
Baby:
Definition: A plane figure with all the same properties as a parallelogram, plus it shares the same properties from BOTH the rhombus and the rectangle!
| Square |
Definition: A plane figure with all the same properties as a parallelogram, plus it shares the same properties from BOTH the rhombus and the rectangle!
Cousin:
Definition: A four-sided plane figure that has only two sides parallel.
| Trapezoid |
Definition: A four-sided plane figure that has only two sides parallel.
| Table of Contents | Quadrilateral Practice | Glossary | Objectives |