Very basic intro to similar triangles including a definition of similar triangles
GCSE - General Certificate of Secondary Education
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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.
Math Warehouse
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This website contains a video tutorial on similar triangles along with setting up proportions to solve them.
Algebra.com
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A description and interactive page defining similar triangles and explaining the meaning of their sides being in proportion to one another. Also introduces theorems for proving triangles are similar.
Math Open Reference
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