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en.wikipedia.org/wiki/Rectangle

In Euclidean plane geometry, a

www.mathsisfun.com/geometry/rectangle.html

www.coolmath.com/reference/rectangles

Definitions and formulas for the perimeter of a

reference.wolfram.com/language/ref/Rectangle.html

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Properties and rules of

mathworld.wolfram.com/Rectangle.html

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The

www.mathgoodies.com/lessons/vol1/area_rectangle.html

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 ...

www.ixl.com/math/grade-3/find-the-area-of-rectangles-and-squares

Fun math practice! Improve your skills with free problems in 'Find the area of

www.khanacademy.org/math/basic-geo/basic-geo-area-and-perimeter/basic-geo-unit-squares-area/e/find-area-of-rectangles-by-counting-unit-squares

Practice finding the area of

Answers

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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