Similar triangles - sides, medians, perimeters, altitudes all in same proportion.
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Math Open Reference
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Similar triangles - ratio of areas is the square of the ratio of the sides.
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Math Open Reference
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A discussion of how to prove triangles similar.
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Ask Dr. Math
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This tutorial focuses on the relationships in similar polygons and triangles and provides detailed explanations and diagrams.
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Think Quest
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Similar triangle test: SAS, AA, SSS
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Pink Monkey
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Very basic intro to similar triangles including a definition of similar triangles
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GCSE - General Certificate of Secondary Education
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Discusses ratios of similar triangles
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Math Warehouse
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This site compiles the different ways of proving triangles are similar.
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Quickie Math
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This site gives a brief explanation of similar triangles with examples and practice problems for finding the similarity ratio of two similar triangles.
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Math Warehouse
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This website contains a video tutorial on similar triangles along with setting up proportions to solve them.
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Algebra.com
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