A helpful scientific calculator that runs in your web browser window.
Holt Online Learning
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This site shows the definition of similar polygons with the relationship of corresponding angles and how corresponsing sides are in proportion.
Math Open Reference
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This site has a tutorial and then some examples of how to write proportions to solve for missing lengths of similar polygons
Math.com
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Powerpoint on similar Polygons
Henrico Schools
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Very basic intro to similar triangles including a definition of similar triangles
GCSE - General Certificate of Secondary Education
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Slideshow about similar polygons
Slideboom
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