Try this Drag the orange dots on each vertex
to reshape the quadrilateral.

The quadrilateral is any 4-sided polygon. But it is the parent of a whole family of figures, each with their own distinct names and characteristics. See also Tetragon.

Quadrangle ("four angles") is another name for a quadrilateral. However, it is a word often used for an open space where people gather, say on a school or university campus. In this case the quadrangle (or "quad") is usually a rectangle or square.

Square |
All sides equal, all angles 90°. See Definition of a square |

Rectangle |
Opposite sides equal, all angles 90°. See Definition of a rectangle |

Parallelogram |
Opposite sides parallel. See Definition of a parallelogram |

Trapezoid |
Two sides parallel. See Definition of a trapezoid |

Rhombus |
Opposite sides parallel and equal. See Definition of a rhombus |

Kite |
Adjacent pairs of sides equal. See Definition of a kite |

- Polygon general definition
- Quadrilateral
- Regular polygon
- Irregular polygon
- Convex polygons
- Concave polygons
- Polygon diagonals
- Polygon triangles
- Apothem of a regular polygon
- Polygon center
- Radius of a regular polygon
- Incircle of a regular polygon
- Incenter of a regular polygon
- Circumcircle of a polygon
- Parallelogram inscribed in a quadrilateral

- Square
- Diagonals of a square
- Rectangle
- Diagonals of a rectangle
- Golden rectangle
- Parallelogram
- Rhombus
- Trapezoid
- Trapezoid median
- Kite
- Inscribed (cyclic) quadrilateral

- Regular polygon area
- Irregular polygon area
- Rhombus area
- Kite area
- Rectangle area
- Area of a square
- Trapezoid area
- Parallelogram area

- Perimeter of a polygon (regular and irregular)
- Perimeter of a triangle
- Perimeter of a rectangle
- Perimeter of a square
- Perimeter of a parallelogram
- Perimeter of a rhombus
- Perimeter of a trapezoid
- Perimeter of a kite

- Exterior angles of a polygon
- Interior angles of a polygon
- Relationship of interior/exterior angles
- Polygon central angle

- Tetragon, 4 sides
- Pentagon, 5 sides
- Hexagon, 6 sides
- Heptagon, 7 sides
- Octagon, 8 sides
- Nonagon Enneagon, 9 sides
- Decagon, 10 sides
- Undecagon, 11 sides
- Dodecagon, 12 sides

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