# 63. Squares

Dear readers,

You might think this one is a no-brainer. **Squares are rectangles**. But a lot of people have trouble remembering this simple rule:

*Squares* are always *rectangles*

BUT

*Rectangles* are not always *squares*.

So, let’s start from the beginning.

*What is a rectangle? *

A rectangle is a *quadrilateral*, which means it has **four sides**.

But beware! Not all quadrilaterals are rectangles.

A rectangle is a *parallelogram*, which means it’s made up of **two pairs of parallel lines**.

But once again, you can be tricked here – since not all parallelograms are rectangles!

A rectangle also has **four, and only four, 90 degree angles**.

And that’s it!

A square has all of those things:

**Four sides**

**Parallel lines**

**90 degree angles**

BUT

To be a *square*, all four sides must be the* same length*.

Therefore,

A *square* is always a *rectangle*

BUT

A *rectangle* is not always a *square*.

Lesson learned.

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