Class 8 Maths Visualising Solid Shapes Faces, Edges and Vertices

Faces, Edges and Vertices

Let us consider a cube.

Each side of the cube is a flat surface called a flat face or simply a face.

When two faces meet at a line segment then it is called an edge.

Three edges meet at a point called a vertex.

                            Class_8_Visualising_Solid_Shapes_Different_View_Of_Cube

Each of these solids is made up of polygonal regions which are called its faces. These faces meet at edges which are line segments and the edges meet at vertices which are points. Such solids are called polyhedrons.

 Class_8_Visualising_Solid_Shapes_Polyhedrons

                                         

 Regular polyhedrons:

 

A polyhedron is said to be regular if its faces are made up of regular polygons and the same number of faces meet at each vertex.

 Class_8_Visualising_Solid_Shapes_Regular_Polyhedrons

                                            

Here, figure 1 is a regular polyhedron whereas figure 2 is not polyhedron.

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