What is a Four-Sided Shape?

Four-sided is a term that is not commonly used in mathematics or geometry. However, I can provide some possible interpretations based on the context of your question.

If you are asking about a shape with four sides, then the correct term would be "quadrilateral." A quadrilateral is a polygon with four sides, and it can be either convex or concave. Examples of quadrilaterals include rectangles, squares, trapezoids, and rhombuses.

On the other hand, if you are asking about a shape that has four sides in a more abstract sense, then the term "four-sided" might be used to describe a shape that has four edges or boundaries, but does not necessarily have four sides in the classical sense. For example, a tesseract (a four-dimensional cube) could be described as having four-sided faces, even though it does not have four sides in the two-dimensional sense.

In summary, the term "four-sided" is not a commonly used term in mathematics or geometry, and it can be interpreted in different ways depending on the context of the question.