none!
If it is a square, then all of the sides are straight...
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A pentagon has five sides.
Most triangles, quadrilaterals, and other polygons with five or more sides; most closed shapes with curved sides.Most triangles, quadrilaterals, and other polygons with five or more sides; most closed shapes with curved sides.Most triangles, quadrilaterals, and other polygons with five or more sides; most closed shapes with curved sides.Most triangles, quadrilaterals, and other polygons with five or more sides; most closed shapes with curved sides.
3 1 curved and 2 straight
One curved side and NO corners.
It has at least 3 sides. It can have as many sides as it wants as long as it is closed and none of the sides are curved. A polygon with 4 sides is a quadrilateral.