It is any two-dimensional shape that has 4 sides formed by straight lines. It can be a square, rectangle, rhombus, rhomboid, parallelogram, or trapezoid. Its four included angles will total 360° (for a concave shape, one will exceed 180°).
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a quadrilateral
A quadrilateral is a 100% 4 sided shape.
A quadrilateral is a 4 sided shape.
Which shape is not a quadrilateral
Quadrilateral.