acute angle, An angle whose measure is less than 90 degrees., obtuse angle, An angle whose measure is more than 90 degrees., right angle, An angle whose measure is exactly 90 degrees., angle, A figure formed by joining two rays., parallel lines, Two lines that never meet., perpendicular lines, Two lines that form four right angles., protractor, An instrument used to measure angles., straight angle, An angle whose measure is 180 degrees., revolution angle, An angle whose measure is 360 degrees., reflex angle, An angle whose measure is more than 180 degrees., degrees, The measure for angles.

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