The intersection where three or more edges meet is called a/an 

An arrangement of plane figures connected at there edges lying in the same plane which can be folded to make a $3$-dimensional solid is called a/an  

The number of vertices in a cone is 

The number of ways a cylinder can be made from a rectangular sheet of paper is

Euler's formula is

Which of the following solids have maximum number of edges? 

Verify Euler's formula for cuboid.

Verify Euler's formula for tetrahedron.