polygon - A closed figure in a plane formed by three or more line segments., triangle - A polygon with exactly three sides, quadrilateral - A polygon with four sides, parallelogram - A quadrilateral with both pairs of opposite sides parallel and congruent, trapezoid - A quadrilateral with exactly one pair of parallel opposite sides, square - A parallelogram with four congruent sides and four right angles., perimeter - Distance around a flat shape,

Two- Dimensional Geometry-3rd Grade

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