Properties of 2 Dimensional Shapes

an equilateral triangle has 3 internal angles and 3 lines of symmetry.

a square has 4 internal angles and 4 lines of symmetry.

a regular pentagon has 5 internal angles and 5 lines of symmetry.

a regular hexagon has 6 internal angles and 6 lines of symmetry.

a regular octagon has 8 internal angles and 8 lines of symmetry.

Is there a pattern here? What is it?

Mind you... maybe I've got this completly wrong. Perhaps
you should fold the shapes for yourself to check the validity
of my findings.