it's a Quadrilateral or a polygon.
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A parallelogram is a 2-dimensional figure with four sides. Each pair of opposite sides is parallel.The root "gram" is a reference to something marked or written, a figure.The root "parallel" is a reference to parallel lines.So a parallelogram is a figure in which parallelism is a prominent characteristic.
A quadrilateral is a 4 sided figure such as a square, rectangle, rhombus, parallelogram, kite ... etc
A rhombus, square, kite or arrowhead.
A rectangle (opposite sides are parallel which is a parallelogram!)
A parallelogram is a two-dimensional figure, so it has two dimensions.