In geometry, a **square** is a regular quadrilateral. This means that it has four equal sides and four equal angles (90-degree angles, or right angles). It can also be defined as a rectangle in which two adjacent sides have equal length. A square with vertices ABCD would be denoted *ABCD*.

The square is the n=2 case of the families of n-hypercubes and n-orthoplexes.

Read more about Square: Characterizations, Perimeter and Area, Coordinates and Equations, Construction, Properties, Other Facts, Non-Euclidean Geometry, Graphs

### Famous quotes containing the word square:

“Rationalists, wearing *square* hats,

Think, in *square* rooms,

Looking at the floor,

Looking at the ceiling.

They confine themselves

To right-angled triangles.”

—Wallace Stevens (1879–1955)

“A man who is good enough to shed his blood for his country is good enough to be given a *square* deal afterwards. More than that no man is entitled to, and less than that no man shall have.”

—Theodore Roosevelt (1858–1919)

“Houses haunt me.

That last house!

How it sat like a *square* box!”

—Anne Sexton (1928–1974)