A square, a rectangle, an equilateral triangle, an isosceles triangle, a rhombus ..... etc.
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No, a pair of angles that are supplementary will always have a sum of 180 degrees, while a pair of angles that are congruent will have the same measure. Therefore, it is not possible for a pair of angles to be both supplementary and congruent.
That would have to be a scalene triangle.
They are congruent angles.
Parrelle lines are congruent. Think of a square and its angles(;
Any polygon with an even number of sides (vertices) in which at least one pair of opposite angles are of the same measure.