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)

“Mark you the floore? that *square* & speckled stone,

Which looks so firm and strong,

Is Patience:”

—George Herbert (1593–1633)

“I would say it was the coffin of a midget

Or a *square* baby

Were there not such a din in it.”

—Sylvia Plath (1932–1963)