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ResourceSpotlight
In this activity, students will explore the Euler Line of a triangle. Students will discover that the centroid, circumcenter, and orthocenter are collinear. Students will also find that if the triangle is isosceles, then the centroid, circumcenter, incenter, and orthocenter are all collinear. Students will also look at ratios involved in the Euler line.
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Texas Instruments, Inc.
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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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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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Tell whether the figure is a polygon. If not, tell why. If it is, tell if its concave or convex.
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Tutor.com
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A selection of answers from the Dr. Math archives.
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Ask Dr. Math
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Great description on all parts of a Polygon.
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Math.com
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This website will lay out the names of polygons according to the number of sides.
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AAA Math
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