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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:

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