Area and Perimeter of a Triangle, Rectangle, Parallelogram, Trapezoid and Circle

By Deb Russell, About.com Guide

See next (below) for trapezoid, rectangle, parallelogram and triangle.

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• Surface Area and Perimeter of a Triangle
• Surface Area and Perimeter of a Trapezoid
• Surface Area and Perimeter of a Rectangle
• Area and Perimeter of a Parallelogram
• Area and Perimeter of a Circle

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