Which term describes a shape with at least three sides?

A shape with at least three sides is referred to as a polygon. This term encompasses a wide variety of shapes, including triangles, quadrilaterals, pentagons, and so on, each defined specifically by the number of sides they possess. Polygons are two-dimensional figures formed by straight line segments that connect at vertices, creating a closed shape.

In contrast, circles, arcs, and curves do not meet the criteria for polygons. A circle, for instance, has one continuous curved line and no straight sides. An arc represents a portion of a circle and also lacks straight edges. A curve refers to any continuous and smooth flowing line without sharp angles or sides. Therefore, the definition of a polygon clearly distinguishes it from shapes that do not have straight edges or a minimum of three sides.