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angle
| My geometry teacher was sometimes acute, and sometimes obtuse, but he was always right. |
| —anonymous |
The opening between two lines or two planes that meet; the word comes from the Latin angulus for a sharp bend. Angles are measured in degrees. A right angle has 90°, an acute angle less than 90°, an obtuse angle has between 90° and 180°. If an angle exceeds the straight angle of 180° it is said to be convex. Complementary angles add to give 90°, supplementary angles make a total of 180°.
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• GEOMETRY
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