They are called heptagons.
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Ah, what a happy little question! When you cut an octagon in half, you get two shapes called trapezoids. They have one pair of parallel sides and one pair of non-parallel sides, creating a unique and beautiful shape. Just like in painting, every shape has its own special charm and purpose.
A polygon with seven sides is called a septagon.
Five-sided shapes are called pentagons.
Polygons
Shapes with 4 sides are called Quadrilaterals.There are special types of quadrilateral:Parallelogram, Rectangle, Rhombus, Square, Trapezoid, Kite.If it isn't one of those it is an irregularquadrilateral.