What mathematical concept involves shapes and their properties?

The correct choice is Geometry because it specifically focuses on the study of shapes, their properties, and the relationships between them. Geometry encompasses concepts such as points, lines, angles, surfaces, and solids, allowing for the exploration of both two-dimensional and three-dimensional forms.

In contrast, Algebra primarily deals with numbers and the rules for manipulating them, including equations and variables. Calculus focuses on change and motion, exploring concepts such as limits, derivatives, and integrals, which are not directly related to the properties of shapes. Statistics, on the other hand, involves the analysis and interpretation of numerical data, often dealing with averages, distributions, and probability, rather than geometrical shapes. Thus, Geometry is the appropriate context for the study of shapes and their properties.