RS Aggarwal Solutions for Class 6 Chapter 19 “Three-dimensional-shapes” In geometry, a three-dimensional shape can be defined as a figure or an object, or that has three dimensions – length, width and height. Unlike two-dimensional shapes, three-dimensional shapes have thickness or depth. A closed figure with length, height and width is known as a three-dimensional shape or figure. Faces, edges and vertices are the attributes of Three-Dimensional Shapes. Cube, cone, prism, cylinder, square, pyramid, sphere are examples of Three-Dimensional Shapes.