**Three-dimensional objects or solids generally have length, breadth and height. Three-dimensional objects look different from different locations or angles. A polyhedron is a solid shape bounded by polygons whereas non-polyhedrons do not have polygon-shaped faces. Objects that occupy space are called solid shapes. Their surfaces are called faces. Faces meet at edges and edges meet at vertices. A bite 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. The chapter is exciting since it deals with viewing 3-D shapes, Mapping the space around us, and learning about faces, edges and vertices. The chapter also discusses Eulerâ€™s formula, which states that F + V â€“ E = 2, where F is Faces, V is Vertices and E is Edges, along with its application.
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