It can be a quadrilateral, though quadrilaterals are 4-sided shapes in general.
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A 1000 sided polygon is called a chiliagon.
A five-sided geometric shape is a pentagon.
A fourteen-sided regular polygon is called a tetradecagon or a tetrakaidecagon.
you call a seven sided shape a heptagon.
A nine sided POLYGON is called a nonagon. Any plain shape bounded by nine straight sides is a nonagon.