The *perimeter* is the distance around a given shape. On the ASVAB, you may be asked to find the perimeter of a polygon. A *polygon* is any shape with three or more straight sides. This means that triangles are polygons. Squares and other quadrilaterals are also polygons. So are shapes with five, six, or more straight sides. It is usually easy to calculate the perimeter of a polygon. All you have to do is add up the lengths of the sides. When two or more sides are equal in length, you can use multiplication.

**Perimeter of a Square or a Rhombus.** If the length of one side of a square is 6 feet, then the perimeter is 6 ft + 6 ft + 6 ft + 6 ft = 24 ft. Because the four sides of a square are equal, you can ...

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