Right angle , An angle that makes a \(90^{\circ }\) square corner., Acute Angle, An angle smaller than a right angle., Obtuse angle , An angle larger than a right angle., Parallel lines , Lines that are always the same distance apart and never intersect., Perpendicular lines , Lines that intersect at a right angle [\(90^{\circ }\)]., Line segment , Lines that intersect , Ray , A straight path with one endpoint that goes on forever in one direction, Perimeter , The total distance around the outside of a 2D shape..

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