Build shapes from smaller shapes

A composite shape is understood as a whole formed by joining familiar two-dimensional shapes, such as triangles, squares, and rectangles, or simple three-dimensional shapes, such as cubes and rectangular prisms; the same whole may have more than one valid decomposition. Reasoning focuses on how parts fit together and how the parts’ attributes contribute to the resulting figure, without requiring formal area or volume calculations, generalized transformations, or advanced geometric constructions.