Quadrilateral, polygon with 4 sides, Rhombus, 4 congruent sides, Rectangle, 2 sets of parallel sides; 4 square corners, Polygon, flat (2D); closed; straight sides, Triangle, 3 sides; 3 vertices; straight lines, Pentagon, 5 sides; 5 vertices; straight lines, Hexagon, 6 sides; 6 vertices; straight lines, Octogon, 8 sides; 8 vertices; straight lines, Parallel, opposite lines; never touch; same distance apart, Right Angle, two lines meet to form a square corner, Congruent, same size; same shape, Trapezoid, quadrilateral with 1 set of parallel lines, Parallelogram, quadrilateral with 2 sets of parallel lines, Square, 4 congruent sides; 4 square corners.

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