A dodecagon
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Dodecagon 12 sides with 12 angles
A regular polygon with exterior angles of 30 degrees has: 360/30 = 12 sides
12 sides
A polygon has as many angles as sides, so a polygon with 10 sides (decagon) would have 10 angles.
Not possible in this Universe. Smallest regular polygon is a triangle when interior angles are 60o. If exterior angles are 30o the polygon has 360/30 ie 12 sides.