One pair of opposite sides - the non-parallel ones.
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An isosceles trapezoid
Opposites sides of an isosceles trapezoid are congruent
Yes the non parallel sides of an isosceles trapezoid are congruent
A parallelogram has two pairs of sides that are parallel when a trapezoid only has one. A parallelogram's opposite sides are congruent and opposite angles are congruent. A trapezoid has no opposite congruent sides or angles, unless it's an isosceles trapezoid, which base angles are congruent. They both have four sides and four interior angles that add up to 360 degrees.
That is correct