line segment - A part of a line with 2 endpoints , ray - A part of a line that has one endpoint and goes on forever in one direction, angle, acute angle, obtuse angle - an angle with a measure greater than 90 degrees but less than 180 degrees, right angle - an angle that measures exactly 90 degrees , vertex - The point where 2 line segments, lines, or rays meet to form an angle. , arc, straight angle - A straight angle measures exactly 180 degrees. , perpendicular lines - 2 lines that intersect and make a right angle , parallel lines - 2 lines that will never intersect or cross , protractor - a tool for measuring and drawing angles,

Module 6- Angle Measurements and Plane Figures

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