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.

May 5

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