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In geometry, a square is a regular quadrilateral, which means that it has four equal sides and four equal angles (90-degree angles, or. 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.

### Characterizations

## Convex polygon

## Quadrilateral

## If and only if

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### Properties

### Coordinates and equations

### Construction

### Symmetry

### Squares inscribed in triangles

### Squaring the circle

### Non-Euclidean geometry

### Crossed square

### Graphs