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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