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en.wikipedia.org/wiki/Rectangle

In Euclidean plane geometry, a

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

Properties and rules of

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Definitions and formulas for the perimeter of a

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quatr.us/math/geometry/rectangle.htm

A

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The area of a polygon is the number of square units inside the polygon. To understand the difference between perimeter and area, think of perimeter as the ...

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The

www.gnu.org/s/emacs/manual/html_node/emacs/Rectangles.html

12.5

Answers

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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