Rectangle

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).

Properties of a rectangle

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:

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

Types of polygon

Area of various polygon types

Perimeter of various polygon types

Angles associated with polygons

Named polygons