An acute angle  - is an angle whose measure is less than 90 degrees. , An obtuse angle  - is an angle whose measure is more than 90 degrees., A right angle  - is an angle whose measure is exactly 90 degrees., An angle - is a figure formed by joining two arms., A vertex  - is the point where two arms meet., Perpendicular lines  - refers to two lines that form four right angles. , A protractor - is an instrument used to measure angles. , A straight angle  - is an angle whose measure is 180 degrees., A revolution angle  - is an angle whose measure is 360 degrees., A reflex angle  - is an angle whose measure is more than 180 degrees., Degrees - refers to the measure for angles. , A ray - is a line with one endpoint. , Parallel lines  - are lines which are same distant apart but will never meet or intersect. , Intersecting lines - are lines that cross at one point and form angles that are NOT right angles. , A point - is a dot is an exact location. ,

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