Write down the number of edges of a Rectangular pyramid.

Write down the number of edges of a Cube.

Write down the number of edges of a Triangular prism.

Write down the number of vertices of a cuboid.

A cube has$\_\_\_\_\_$ vertices, $\_\_\_\_\_$edges and $\_\_\_\_\_$ faces.

Define Euler's relation between the number of faces, number of edges and number of vertices for various $3-$dimensional figures.