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Yes, an isosceles trapezoid has one pair of congruent opposite sides and congruent base angles
congruent congruent
An isosceles trapezoid only has 1 pair of congruent sides. It is drawn like this:
The only real characteristic of a trapezoid is that one pair of opposite sides is parallel. For an isosceles trapezoid, in addition to one pair of opposite sides being parallel; the legs are congruent; each pair of base angles is congruent; and the diagonals are congruent.
They are supplementary