How to find the area of an irregular polygon by breaking it down into triangles
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Math Open Reference
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Apothem of a regular polygon
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Math Open Reference
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This gives step by step instructions on how to construct similar polygons includes a JavaSketchpad for interaction.
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To construct a polygon similar to a given polygon and with a given ratio of similitude.
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A page with links for properties of circles and different types of polygons. Each link has great visuals with clear markings, definitions, and formulas.
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Cool Math
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Describes the special relationships of the sides, angles, and diagonals of a rhombus.
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Zona Land
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A biography of Thales. A short description of his life and contributions to the study of geometry. Links to other resources.
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Math Open Reference
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Formula and description of the perimeter of a trapezoid.
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Math Open Reference
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Trapezoid median (midline or midsegment) definition and properties
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Math Open Reference
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Area of a trapezoid. Definition and formula
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Math Open Reference
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