Perimeter and Surface Area Formulas

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

A trapezoid is another special quadrangle where only two sides are parallel to each other.
The perpendicular distance between the two parallel sides is called the height ( h ).

Perimeter = a + b₁ + b₂ + c
Area = ½( b₁ + b₂ ) x h

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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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