
Manipulative 1  Rectangle. Created with GeoGebra.


A rectangle is a
quadrilateral
(four sided figure) with
vertices
that make
right angles.^{[1]}
Properties of Rectangles
 All rectangles have four sides.
 The corners of rectangles are right angles
 Opposite sides of a rectangle are
congruent.
 Opposite sides of a rectangle are
parallel.
 The diagonals
of a rectangle are congruent.
 The diagonals of a rectangle
bisect
each other.
 All squares
are also rectangles.
 A rectangle is also a
parallelogram.
Given the length (l) and width (w) of a rectangle:
Formula  Description 
A = l·w  The area of a rectangle is the length times the width. 
P = 2·(l + w)  The length of the perimeter of a rectangle is twice the length plus the width. 
 The length of a diagonal of a rectangle is the square root of the length squared plus the width squared. This is derived using the Pythagorean Theorem. 
Table 1: Formulas of a rectangle. 
