If the they are plain figures ( 2 - dimensional), then they are pentagons.
Remember you Latin ; 'Penta' means five(5).
Pentagons can be regular ( all sides the same length ) , or irregular ( the sides are of different lengths).
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Squares are regular all the time. Diamonds, hexagons and pentagons are sometimes regular.
No but they are all quadrilaterals
Quadrilateral.
They are endecagons (or hendecagons).
All 7 sided shapes are called heptagons.