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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.
5
360 degrees
Any regular polygon with 5n sides, or any 5n pointed star (where n is an integer)
There could be none, there could be 5.