A square
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A regular polygon must have all its sides equal and all its angles equal. The only regular quadrilateral is a square.
A regular quadrilateral is a a four sided shape that has all of its sides equal in length. There are two shapes that satisfy these conditions, a square and a rhombus.
just have 4 lines that join up... a quadrilateral is a 4 sided shape
a quadrilateral shape is any shape with 4 sides , that's why its called QUADrilateral.
A quadrilateral is a shape that has 4 sides.