A quick way to test your knowledge of angle types
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Math Open Reference
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Coplanar objects are those lying in the same plane
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Math Open Reference
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Definition and properties of adjacent angles - those that share a common leg or ray
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Math Open Reference
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Definition of an acute angle (one less than 90 degrees).
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Math Open Reference
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Definition of 'altitude' and the various different ways the word is used in geometry
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Math Open Reference
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A discussion of negative angles.
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Ask Dr. Math
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Gives examples of problems with intercepted arc, central angle, and angles inside and outside the circle.
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Online Math Learning
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Identify the missing angle measurement in each set of complementary angles. Answers included.
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Math-Drills.com
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Explanation of acute angles
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Math is Fun
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