acute angle, an angle that is less than 90°, right angle, an angle that is exactly 90°, obtuse angle, an angle that is greater than 90° and less than 180°, straight angle, an angle that is exactly 180°, reflex angle, an angle that is greater than 180° and less than 360°, full angle, an angle that is exactly 360°, alternate interior angles, alternate exterior angles, corresponding angles, vertical angles

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