Similar triangles - all three sides in same proportion. SSS
Math Open Reference
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Explanation of right angles
Math is Fun
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A quick way to test your knowledge of angle types
Math Open Reference
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Discussion of the way angles are measured in degrees, minutes, seconds.
Math Open Reference
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Coplanar objects are those lying in the same plane
Math Open Reference
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Definition and properties of adjacent angles - those that share a common leg or ray
Math Open Reference
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Definition of an angle.
Math Open Reference
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Identify the missing angle measurement in each set of complementary angles. Answers included.
Math-Drills.com
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Explanation and example of angles around a point.
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Basic overview of supplementary angles
Math is Fun
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