From Latin: rectus "right" + angle
Drag the orange dots on each vertex
to reshape the rectangle.
The rectangle, like the
is one of the most commonly known
quadrilaterals. It is defined as having all four interior angles 90°
Properties of a rectangle
- Opposite sides are
Adjust the rectangle above and satisfy yourself that this is so.
- The diagonals
bisect each other
- The diagonals are
Use the calculator on the right 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:
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
but with extra limitation that the angles are fixed at 90°.
See Parallelogram definition and adjust the parallelogram to create a rectangle.
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
Rectangle (Coordinate Geometry)
Other polygon topics
Types of polygon
Area of various polygon types
Perimeter of various polygon types
Angles associated with polygons
(C) 2009 Copyright Math Open Reference. All rights reserved