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30-60-90 Triangles II

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Mathematics

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https://www.khanacademy.org/math/geometry-home/right-triangles-topic/special-right-triangles/v/intro-to-30-60-90-triangles

More examples using 30-60-90 triangles.
More free lessons at: http://www.khanacademy.org/video?v=3mLUJSoh6i0