All regular polygons with an even number of angles.
All the angles of polygons with an odd number of angles are also equal but there are no "opposite" angles.
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If only two sides of one figure are congruent to two sides of another figure, you can say nothing about the opposite angles.
the opposite angles are congruent
square and a rectangle
No. In a parallelogram, opposite angles are congruent.
Opposite angles are congruent in a parallelogram.