Raise your hand if you teach about lines and angles in geometry! I see you! Here are some great visuals and reference guides for students mastering questions that require them to classify lines and classify and measure angles. These sheets define and model points, line segments, lines, rays, parallel lines and segments, perpendicular lines and segments, right angles, acute angles, obtuse angles, compose angles, and decompose angles. There is also a sheet on measuring angles. This sheet models ho