Any pentagon has.
A triangle as no other 2d shape can have 3 sides.
A 2D shape with 9 sides is called a Nonagon.
The shape of 2D is a flat surface.
The shape is a regular pentagon.
A 2D shape that has four sides and is thirteen letters long is a quadrilateral.
There is no such shape. A 2d shape with 5 sides and all equal angles must be a regular pentagon (or a 5-pointed star if you stretch the definition of "all angles"). And a regular pentagon - or star - has 5 lines of symmetry.
Not sure about angels since I do not believe in heavenly beings but, a pentagon has 5 angles and 5 sides.
2d shapes that do not have equal sides do not usually have special names.
Any 4 sided 2D shape