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# Quadrilaterals: FAQ

Frequently asked questions about quadrilaterals.

## What is a quadrilateral?

A quadrilateral is a polygon with $4$ sides.

## What are some common types of quadrilaterals?

Some common types of quadrilaterals include squares, rectangles, rhombuses, and trapezoids.

## What is the difference between a square and a rectangle?

A square has four sides that are all the same length, while a rectangle has two sets of two sides that are the same length.

A square is

*always*is a rectangle but a rectangle is**not**a square.## What is a right angle?

A right angle is a type of angle that looks like the corner of a square. When two lines meet at a right angle, they form a $90$ degree angle.

One way to tell if an angle is a right angle is to use a tool called a protractor to measure it. Another way is to use a right angle ruler or "square" to see if the two lines line up perfectly with the tool.

## Want to join the conversation?

- How is a rectangle not a square but a square is a rectangle?(58 votes)
- A square is a rectangle because it meets all the criteria of a rectangle: it has four sides, and all its angles are right angles. However, for a square, all its sides are the same length!

Now, a rectangle can have sides of different lengths, as long as the opposite sides are equal. But if all four sides of a rectangle were the same length, then it wouldn't just be a rectangle anymore, it'd also be a square! So, a rectangle can be a square, but only if all its sides are the same length. Otherwise, it's just a rectangle, not a square.(38 votes)

- a right angle is two lines the look like this L(12 votes)
- in a Square there are specifically 4/four right angles. "ha am I right(get it)!(8 votes)

- Why’s a square a rectangle but a rectangle is not a square(7 votes)
- The sides of a square are all the same length. The sides of a rectangle are not always equal in length.(6 votes)

- how is a square a rectangle but a rectangle is not a square(8 votes)
- because that´s the way of life(2 votes)

- can you add more lesson about quadrilaterals(7 votes)
- what is right angle(3 votes)
- A angle that is 90 degrees(2 votes)

- can we have games on khan Academy(4 votes)
- YEAH we should.(2 votes)

- Just asking can you make some games in Khan academy(5 votes)
- I wish but we are working on something......(0 votes)

- Why is a rectangle not a square but a square is literally a rectangle?(3 votes)
- because the sides of a square are equal but the sides of a rectangle are not(1 vote)

- your better than zear(3 votes)