There are called quadrilaterals, or quadrangles.
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A quadrilateral
A quadrilateral because it has 4 sides
A quadrilateral because it has 4 sides.
A shape with four unequal sides is called an irregular quadrilateral.
A Square has 4 sides, the shape you want that has twice as many sides as this is called a Octagon. ( Oct = 8 - as in Octopus ).