Rectangle - math word definition with calculator - Math Open Reference
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).
Properties of a rectangle
- 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
Calculator
| 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.
Other ways to think about rectangles
A rectangle can be thought about in other ways:- 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.
Coordinate Geometry
In coordinate geometry, a rectangle has all the same properties described here, but also, the coordinates of its vertices (corners) are known. See Rectangle (Coordinate Geometry) for more.Other rectangle pages:
Area of a rectangle
Perimeter of a rectangle
Golden rectangle
Rectangle (Coordinate Geometry)
Other polygon topics
General
- 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
Types of polygon
- Square
- Diagonals of a square
- Rectangle
- Diagonals of a rectangle
- Golden rectangle
- Parallelogram
- Rhombus
- Trapezoid
- Trapezoid median
- Kite
- Inscribed (cyclic) quadrilateral
Area of various polygon types
- Regular polygon area
- Irregular polygon area
- Rhombus area
- Kite area
- Rectangle area
- Area of a square
- Trapezoid area
- Parallelogram area
Perimeter of various polygon types
- 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
Angles associated with polygons
- Exterior angles of a polygon
- Interior angles of a polygon
- Relationship of interior/exterior angles
- Polygon central angle
Named polygons
- 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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