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:

    This house was designed and constructed with the freedom of stroke of a forester’s axe, without other compass and square than Nature uses.
    Henry David Thoreau (1817–1862)

    I walked by the Union Square Bar, I was gonna go in. And I saw myself, my reflection in the window. And I thought, “I wonder who that bum is.” And then I saw it was me. Now look at me, I’m a bum. Look at me. Look at you. You’re a bum.
    —J.P. (James Pinckney)

    Mark you the floore? that square & speckled stone,
    Which looks so firm and strong,
    Is Patience:
    George Herbert (1593–1633)