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rec·tan·gle
[rek-tang-guhl]
NOUN
1.
a parallelogram having four right angles.
Source: Dictionary.com
rectangles | Define rectangles at Dictionary.com
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Rectangle - Wikipedia

en.wikipedia.org/wiki/Rectangle

In Euclidean plane geometry, a rectangle is a quadrilateral with four right angles. It can also be defined as an equiangular quadrilateral, since equiangular ...

Rectangle - Math is Fun

www.mathsisfun.com/geometry/rectangle.html

Rectangle. (Jump to Area of a Rectangle or Perimeter of a Rectangle). A rectangle is a four-sided flat shape where every angle is a right angle (90°).

Definition of Rectangle - Math is Fun

www.mathsisfun.com/definitions/rectangle.html

Rectangle. A 4-sided flat shape with straight sides where all interior angles are right angles (90°). Also opposite sides are parallel and of equal length. Example:  ...

Rectangle Sides, Diagonals, and Angles -properties, rules by Example

www.mathwarehouse.com/geometry/quadrilaterals/parallelograms/rectangle.php

Properties and rules of Rectangles, explained with examples, illustrations and practice problems.

Interactivate: Rectangles - Shodor

www.shodor.org/interactivate/discussions/Rectangles/

Student: So, what's the difference between a rectangle and a square? Mentor: Well, let's see. They both have 4 sides, but are the sides the same length?

Rectangle - math word definition - Math Open Reference

www.mathopenref.com/rectangle.html

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).

Rectangle -- from Wolfram MathWorld

mathworld.wolfram.com/Rectangle.html

Rectangle. DOWNLOAD Mathematica Notebook EXPLORE THIS TOPIC IN the MathWorld Classroom Rectangle. A closed planar quadrilateral with opposite ...

Cool math .com - The Properties of a Rectangle (perimeter, area ...

www.coolmath.com/reference/rectangles

Definitions and formulas for the perimeter of a rectangle, the area of a rectangle, how to find the length of the diagonal of a rectangle, properties of the diagonals ...