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The perimeter of a polygon is a the sum of the lengths of all the sides.

www.virtualnerd.com/middle-math/geometry-measurement/rectangle-perimeter-area/rectangle-perimeter-example

virtualnerd.com/pre-algebra/perimeter-area-volume/perimeter-and-area/perimeter/rectangle-perimeter-example

Note: Finding the perimeter of a rectangle is as easy as adding up all its side lengths! This tutorial takes you through the steps needed to find the perimeter of a  ...

www.varsitytutors.com/basic_geometry-help/how-to-find-the-perimeter-of-a-rectangle

The perimeter of a rectangle is found by adding up the length of all four sides. Since the two long sides are 12 cm, and the two shorter sides are 7 cm the ...

www.mathplanet.com/education/pre-algebra/inequalities-and-one-step-equations/calculating-the-area-and-the-perimeter

The perimeter is the length of the outline of a shape. To find the perimeter of a rectangle or square you have to add the lengths of all the four sides. x is in this ...

www.aaamath.com/geo78_x7.htm

An interactive math lesson about calculating the perimeter of a rectangle.

www.mathopenref.com/rectangleperimeter.html

Formula and description of the perimeter of a rectangle.