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A polygon with 4 or more sides can have a pair of parallel sides.
A triangle with a curved bottom is often referred to as a "triangular arc" or a "curvilinear triangle." This shape combines the characteristics of a triangle with a curved edge, deviating from the traditional straight-line sides. In some contexts, it may also be described as a "rounded triangle."
Some types of quadrilaterals don't have parallel sides. Such as a diamond or a kite.
A polygon with 5 sides is called a pentagon.
Some polygons have 5 sides, others have more or fewer. A polygon with 5 sides is a pentagon.