Chapter 19 – Three-Dimensional Figures – R S Aggarwal Solutions for class 8
Let us define some terms to understand the different three dimensional figures:
1) Solids: In geometry, three dimensional figures are also termed as solid object or shape which is having three dimensions namely length, breadth and height.
2) Faces: A face is the flat portion of the 3D figure.
3) Vertices: A vertex is the corner where three faces of a solid meet.
4) Edges: An edge is the point where two faces meet in a line.
Some 3D figures: