Perimeter and Surface Area Formulas

By Anne Marie Helmenstine, Ph.D., About.com Guide

A parallelogram is a quadrangle where opposite sides are parallel to each other.
The perimeter ( P ) is the distance around the outside of the parallelogram.

P = 2a + 2b

The height ( h ) is the perpendicular distance from one parallel side to it's opposite side.

Area = b x h

It is important to measure the correct side in this calculation. In the figure, the height is measured from side b to the opposite side b, so the Area is calculated as b x h, not a x h. If the height was measured from a to a, then the Area would be a x h. Convention considers the side the height is perpendicular to is called the 'base' and usually denoted with a b.

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• Triangle Perimeter and Surface Area Formulas
• Square Perimeter and Surface Area Formulas
• Rectangle Perimeter and Surface Area Formulas
• Parallelogram Perimeter and Surface Area Formulas
• Trapezoid Perimeter and Surface Area Formulas
• Circle Perimeter and Surface Area Formulas
• Ellipse Perimeter and Surface Area Formulas
• Hexagon Perimeter and Surface Area Formulas
• Octagon Perimeter and Surface Area Formulas

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