quadrilateral shape
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no, a quadrilateral cant be curved because it is a closed STRAIGHT sided figure with four sides...
Pentagon
A three sided closed plane figure (shape) is a triangle.
An six-sided object is a hexagon. A hexagon has six straight sides that connect making a closed shape and they are classified as polygons.
A plane figure bounded by some numbers of straight sides is called a polygon. Thus a polygon with ten-sided is called a decagon.