Definition and properties of triangles
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Math Open Reference
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A quick way to test your knowledge of triangle types
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Math Open Reference
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Definition and properties of obtuse triangles
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Math Open Reference
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Formulas for the different types of triangles.
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Ask Dr. Math
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A simple interactive website that shows the 6 different classifications of triangles: right, acute, obtuse, equilateral, isosceles, and scalene.
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Math.com
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This gives step by step instructions on how to construct a triangle given three segments includes a JavaSketchpad for interaction.
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To construct a triangle when three sides are given.
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