Common shapes with less than 4 sides are triangles and circles ( but the circle has no straight sides).
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A two-dimensional shape with one curved side and four straight sides can be created, but there is not specific name for such a shape.
A quadrilateral is a shape with four straight sides. There are no curved sides in a quadrilateral.
A shape that has four straight sides and four angles is defined as a quadrilateral. If all four angles are right angles, it is a rectangle, and if all four sides are congruent, it is a square.
quadrilateral shape
Quadrilateral simply means 'with four lines', so it is any shape with four straight sides, it doesn't have to have right angles or equal sides.