Math Homework. Do It Faster, Learn It Better.
Perimeter
The perimeter of a polygon (or any other closed curve, such as a circle) is the distance around the outside.
Here are some formulas for the perimeters of common plane figures.
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Shape
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Formula
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Variables
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Square
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is the length of the side of the square. |
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Rectangle
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and are the lengths of the rectangle's sides (length and width). |
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Triangle
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, and are the side lengths. |
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Right Triangle, with legs
and
(see
Pythagorean Theorem
)
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and are the lengths of the two legs of the triangle |
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Circle
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is the radius and is the diameter. |
