no all triangles have 3 angles
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A rectangle. The opposite sides at least must be equal if all four angles are 90o.
A polygon with 4 sides has 4 angles. All polyhedra have at least 4 vertices so I cannot think of any shape that meets the requirements.
A square has to have all 4 right angles, by definition
Quadrilateral
4 corners 4 angles Angles add up to 90' All angles are right angles Has 4 lines of symmetry