Rectangle

Definition

A rectangle is a parallelogram with a right angle.

Note that in a rectangle the opposite sides are congruent (equal in measure).

Demonstration

Image only

Instructions text as in global.js

The Perimeter and Area of a Rectangle

Given the following:

l: The length of the rectangle

w: The width of the rectangle

P: The perimeter of the rectangle

A: The area of the (interior of the) rectangle

P = 2l + 2w or P = 2(l + w)

A = lw^{2}

Note that in many cases the length is usually the longest side and the width is the shortest side [i.e. l > w].

In mathematics the length is the measure of one of two parallel sides and the width is the measure of one of the other two parallel sides [i.e. the length does not have to larger than the width.]

Demonstration of Perimeter and Area (Rectangle)

Image only

Instructions text as in global.js

l:
w: