Acute Angle - angles are less than 900, Obtuse Angle - angles measure more than 900 degrees and less than 1800, Right Angle - measures exactly 900, Reflex Angle - angles measure more than 1800 but less than 3600, Straight Angle - measures exactly 1800 , Complete Angle/ Full Rotation - measures exactly 3600 , Parallel lines - same distance apart and never intersects, Intersecting lines - when two or more lines meet or cross each other, Perpendicular lines - lines meet or cross each other at a 900 angle,

Geometry: Lines and Angles

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