A discussion of the reason for the angle sums formula.
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Ask Dr. Math
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A discussion of angle measures in concave and convex polygons.
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Ask Dr. Math
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A discussion of angle measure sums in concave polygons.
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Ask Dr. Math
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This gives step by step instructions on inscribing a hexagon in a circle includes a JavaSketchpad for interaction.
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To inscribe a regular hexagon in a circle.
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Exterior Angles and Interior Angles
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math warehouse
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A helpful scientific calculator that runs in your web browser window.
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Holt Online Learning
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The worksheets below can be used as part of extra math homework. These geometry worksheets are free and easily printable. They cover typical school work from grade 4 through 8. They include questions on polygons, 3D objects, angles, and calculations of area, volume, etc.
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Helping With Math.com
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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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A discussion of the difficulties of angle terminology.
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Ask Dr. Math
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