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### Course: 4th grade > Unit 11

Lesson 5: Classifying geometric shapes# Quadrilaterals review

Review the following quadrilaterals: parallelogram, trapezoid, rhombus, rectangle, and square. Then, try some practice problems.

## Quadrilateral Summary

Name | Definition | Example |
---|---|---|

Quadrilateral | ||

Parallelogram | ||

Trapezoid | Exactly | |

Rectangle | ||

Rhombus | ||

Square |

To learn more about each shape and practice identifying them, keep reading!

## What is a quadrilateral?

A quadrilateral is a $4$ sided closed figure.

These figures are quadrilaterals:

These figures are NOT quadrilaterals:

The ${\text{first}}$ figure is not closed.

The${\text{second}}$ figure has $5$ sides

The

## Practice set 1: Identifying quadrilaterals

*Want to learn more about quadrilaterals? Check out these videos:*

Types of quadrilaterals

Quadrilateral properties

Classifying quadrilaterals

Types of quadrilaterals

Quadrilateral properties

Classifying quadrilaterals

### What is a parallelogram?

A parallelogram is a quadrilateral with $2$ pairs of parallel sides. In these figures, sides of the same color are parallel to each other.

### Practice set 2: Identifying parallelograms

## What is a trapezoid?

A trapezoid is a quadrilateral with

**exactly**${1\text{pair of parallel sides}}$ .## What is a rectangle?

A rectangle is a quadrilateral with $4$ right angles.

## What is a rhombus?

A rhombus is a quadrilateral with $4$ equal sides.

## What is a square?

A square is a quadrilateral with $4$ equal sides and $4$ right angles.

## Practice set 7: Pulling it all together

*Want to try more problems like this? Check out these exercises:*

Identify quadrilaterals

Quadrilateral types

Categorize quadrilaterals

## Want to join the conversation?

- why can a square be a rectangle but a rectangle can not be a square.(123 votes)
- So a square is a special kind of rectangle, it is one where all the sides have the same length. Thus every square is a rectangle because it is a quadrilateral with all four angles right angles. However not every rectangle is a square, to be a square its sides must have the same length.(78 votes)

- can 10 people vote this up please(86 votes)
- is there a way that a rectangle can be a square without cutting it(8 votes)
- yes, well technically a square is a type of rectangle(27 votes)

- how can a square be a rectangle it is just a square in't it(5 votes)
- A rectangle is just a shape that has four right (90 degree) angles and four sides where opposite sides are parallel. There’s also a special type of rectangle that also has all of the sides be the same length. We call that special type of rectangle a “square”.

I hope this helps!(36 votes)

- it seems that a rhombus cannot be a rectangle without being a square is that true?(13 votes)
- Yes, you are correct. Good job!(12 votes)

- Hi

Why can a square be a rectangle but a rectangle can’t be a square(15 votes)- Hi the reason why a rectangle cant be a square is that a square has 4 sides and 4 right angles and NEEDS to have equal sides and a rectangle can have 4 sides 4 right angles and doesnt need to have equal sides i hope this helps(7 votes)

- if a square is a rhombus , then why can't a rhombus be a square, they look the same.(10 votes)
- Because some one sat on it and ruind the anguls(6 votes)

- why can a square be a rectangle but a rectangle cant be a square?(9 votes)
- Because squares have 4 sides like a rectangle but squares have 4 EQUAL sides. Rectangles have 2 pairs of parallel sides.(5 votes)

- Why do the shapes have the same sides but mean different things(10 votes)
- because the shapes you were talking about fits the rules for your 'different things'(4 votes)

- for all the people wondering for a square to be a rectangle it has to be because a rectangle needs to have 4 right angles which a square has but a square needs equal sides and 4 right angles wich a rectangl does not have(4 votes)