It depends on whether the congruent sides are the non-parallel ones (an isosceles trapezium) or a pair of adjacent sides (no special name).
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Trapezoid.
A trapezoid, in general, does not have congruent sides.
Opposites sides of an isosceles trapezoid are congruent
If it is a normal trapezoid, 2 sides would be equal (the left and right sides).
A trapezoid may have zero or one pair of congruent sides.