Which statement best describes a concave surface?

A concave surface is best described as one that curves inward. This definition aligns with the geometric concept where a concave shape dips or recesses inward, creating a bowl-like effect. For instance, when visualizing a spoon, the part that holds food is a clear example of a concave surface because it curves away from the viewer, providing a hollow area.

In contrast, flat surfaces do not exhibit any curvature, maintaining a consistent plane without any dips or bulges. Surfaces that curve outward are classified as convex, where the shape bulges outward, opposite to concave. Lastly, surfaces characterized by jagged or irregular edges lack uniform curvature and do not fit the definition of a concave structure. Thus, the statement describing a concave surface as one that curves inward accurately captures its defining feature.