The name of a four sided figure (or shape) is called a Square. :)
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A pyramid is a four-sided, three-dimensional figure.
A four sided figure with no parallel sides is a trapezium, but it is also an irregular four-sided polygon, tetragon, quadrilateral, or quadrangle.
Because, in this four sided figure, the opposite sides are parallel to each other.
Square.
A four-sided plane figure.