Identifying quadrilaterals

CCSS Math: 3.G.A.1
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:

Try it yourself

Challenge question 1

Challenge question 2