NCERT Solutions for Class 7 maths Chapter 15 Visualising Solid Shapes

Objects that occupy space are called solid shapes. Their surfaces are called faces. Faces meet at edges and edges meet at vertices. The plane surface of a solid is called its face. An edge of a solid is a line segment, along which two faces meet. A point that is formed by three or more intersecting faces on a solid is called a vertex. Cube, cuboid, sphere, cylinder, cone and the pyramid are examples of solid shapes. Plane figures are two-dimensional while solid shapes are three-dimensional. The corners of solid shape are called its vertices, the line segments of its skeleton are its edges, and its flat surfaces are its faces.