Definition of a reflex angle (one whose measure is greater than 180 degrees but less than 360 degrees).
Math Open Reference
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Definition of an obtuse angle. An angle between (but not including) 90deg and 180 deg;
Math Open Reference
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Defines what is meant by 'interior of an angle'
Math Open Reference
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Included definition: Angle made by two lines with a common vertex.
Math Open Reference
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Definition of a full angle. An angle whose measure is exactly 360°.
Math Open Reference
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Definition and properties of complementary angles - two angles that add to 90 degrees
Math Open Reference
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Use your knowledge of vertical angles and supplementary angles to find the measurements for all angles. Answers included.
Math-Drills.com
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Explanation and diagram of straight angles
Math is Fun
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Explanation of obtuse angles
Math is Fun
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Explanation and diagram of exterior angles.
Math is Fun
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