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# Identifying quadrilaterals

Classify quadrilaterals, including rectangles, rhombuses, and squares.

# Quadrilaterals

A quadrilateral is a polygon with four sides.

### Study some examples

Here are some examples of quadrilaterals:

### Try it yourself

# Special types of quadrilaterals

Some quadrilaterals go by special names like

*rectangle*,*rhombus*, and*square*. Let's learn about them!# Rectangles

What makes a shape a rectangle?

- There are four right angles.
- There are four sides because it's a quadrilateral.

### Study some examples

Here are some examples of rectangles:

### Try it yourself

### Challenge problem

Let's consider one more shape:

# Rhombuses

What makes a shape a rhombus?

- All sides are the same length.
- There are four sides because it is a quadrilateral.

### Study some examples

Here are some examples of rhombuses:

### Try it yourself

# Squares

What makes a shape a square?

- All sides are of equal length.
- There are four right angles.
- There are four sides because it's a quadrilateral.

### Study some examples

Here are some examples of squares: