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an inscribed circle with the center and sides labeled

math.about.com

Determining Areas and Perimeters of Polygons

Use these formulas to help calculate the areas and perimeters of circles, triangles, rectangles, parallelograms, trapezoids, and other polygons.

Bonae Paustian

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Search for easy dinners, fashion, etc.

When autocomplete results are available use up and down arrows to review and enter to select. Touch device users, explore by touch or with swipe gestures.