Q.How many angles has it?
A.Four angles.

Q.What would it make if we draw a line from one angle to the opposite one?
A.Two right-angled isoceles triangles.

Q.What would you call the line that we drew from one angle to the other?
A.A diagonal.

Q.Suppose we draw another line from the other two angles.

A.Then it would make four triangles.
_Pent-agon_.
Q.What is this?
A.A regular pentagon.