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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

dictionary.reference.com/browse/rectangles

dictionary.reference.com/browse/rectangles

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en.wikipedia.org/wiki/Rectangle

In Euclidean plane geometry, a

www.mathsisfun.com/geometry/rectangle.html

www.mathsisfun.com/definitions/rectangle.html

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

Properties and rules of

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

Student: So, what's the difference between a

www.mathopenref.com/rectangle.html

The

mathworld.wolfram.com/Rectangle.html

www.coolmath.com/reference/rectangles

Definitions and formulas for the perimeter of a