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There exists at least one quadrilateral which is not 4-sided.
A square and a rectangle are 4 sided figures each having 4 interior 90 degree angles
a square and a rectangle. Also: trapezium trapezoid parallelogram to have a 4-sided figure, angles don't have to be 90 degrees.
three sided figures consist of only triangles, while a four sided figure consists of any quadrilateral, so you can draw more figures with 4 sideds than with 3