Math Homework. Do It Faster, Learn It Better.
Perimeter, Area, and Volume
1. The perimeter of a polygon (or any other closed curve, such as a circle) is the distance around the outside.
2. The area of a simple, closed, planar curve is the amount of space inside.
3. The volume of a solid shape is the amount of space displaced by it.
Some formulas for common -dimensional plane figures and -dimensional solids are given below. The answers have one, two, or three dimensions; perimeter is measured in linear units , area is measured in square units , and volume is measured in cubic units .
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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. |
Rectangle
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and are the lengths of the rectangle's sides (length and width). |
Triangle
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, and are the side lengths. |
Right Triangle, with legs
and
(see
Pythagorean Theorem
)
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and are the lengths of the two legs of the triangle |
Circle
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is the radius and is the diameter. |
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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. |
Rectangle
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and are the lengths of the rectangle's sides (length and width). |
Triangle
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and are the base and height |
Triangle
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, , and are the side lengths and is the semiperimeter |
Parallelogram
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is the length of the base and is the height. |
Trapezoid
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and are the lengths of the parallel sides and the distance (height) between the parallels. |
Circle
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is the radius. |
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Shape
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Formula
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Variables
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Cube
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is the length of the side. |
Right Rectangular Prism
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is the length, is the width and is the height. |
Prism or Cylinder
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is the area of the base, is the height. |
Pyramid or Cone
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is the area of the base, is the height. |
Sphere
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is the radius. |