Perimeter and Surface Area Formulas

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

A square is a quadrangle where all four sides are of equal length.

Perimeter = 4s
Area = s²

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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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