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a parallelogram having four right angles.
Source: Dictionary.com
rectangles | Define rectangles at Dictionary.com
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Rectangle - Wikipedia


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


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


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


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

Interactivate: Rectangles - Shodor


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


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


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 ...


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 ...