yes, they are all 90 degress.
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Rectangles or squares; both of these have only right angles, so all the angles are congruent.
squares, rectangles, some rhombuses .... I'm not sure all angles can be congruent
rectangles and squares have
Yes. The basic definition for a rectangle is 4 sides, four right angles(perpendicular), and opposite sides are congruent.
In all parallelograms, opposite angles and opposite sides are congruent. If all four sides are congruent, it's a rhombus. If all four angles are congruent, it's a rectangle. If all four sides and all four angles are congruent, it's a square.