Parallel lines - Lines that never touch and are always the same distance apart ,  Perpendicular lines  - Lines that intersect at a right angle, Congruent lines - Equal lines, Acute Angle - Angle less than 90 degrees, Obtuse Angle - Angle Larger than 90 degrees, Right Angle - 90 degrees angle , Reflex Angle - Angle Larger than 180 degrees, Straight Angle - 180 degrees angle , Quadrilateral - A four sided shape that is 2-D, Polygon - Any 2-D shape with straight lines , Rhombi - The plural of a rhombus, Trapezium - Is a quadrilateral but is not a parallelogram, Square - All sides are congruent and has 4 right angles, Rectangle - Sides are not congruent but has 4 right angles,

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