RD Sharma Solutions for Class 6 of Chapter 16 “Three-dimensional-shapes” describes Solid, Cube, Cuboids, Prism, etc. In geometry, a three-dimensional shape can be defined as a solid figure or an object or shape that has three dimensions – length, width and height. Unlike two-dimensional shapes, three-dimensional shapes have thickness or depth. It occupies space defined through the dimensions of height, width and depth. Each of these shapes is a solid and not a flat shape. We will also learn other essential terms like faces, edges and vertices etc. which are associated with these shapes. Here, we get to know about shapes like cuboid, cube, cylinder, right circular cone, sphere, pyramid and tetrahedron.