A 4-sided polygon
where all
interior angles
are 90°

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

The rectangle, like the square, is one of the most commonly known quadrilaterals. It is defined as having all four interior angles 90° (right angles).

- Opposite sides are parallel and congruent Adjust the rectangle above and satisfy yourself that this is so.
- The diagonals bisect each other
- The diagonals are congruent

ENTER THE TWO SIDE LENGTHS | ||

Side 1 | clear | |

Side 2 | clear | |

Area: | ||

Perimeter: | ||

Diagonal: | ||

Use the calculator above to calculate the properties of a rectangle.

Enter the two side lengths and the rest will be calculated. For example, enter the two side lengths. The area, perimeter and diagonal lengths will be found.

- A square is a special case of a rectangle where all four sides are the same length. Adjust the rectangle above to create a square.
- It is also a special case of a parallelogram but with extra limitation that the angles are fixed at 90°. See Parallelogram definition and adjust the parallelogram to create a rectangle.

Area of a rectangle

Perimeter of a rectangle

Golden rectangle

Rectangle (Coordinate Geometry)

- 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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