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The properties of the trapezoid are as follows:The bases are parallel by definition.Each lower base angle is supplementary to the upper base angle on the same side.The properties of the isosceles trapezoid are as follows:The properties of trapezoid apply by definition (parallel bases).The legs are congruent by definition.The lower base angles are congruent.The upper base angles are congruent.Any lower base angle is supplementary to any upper base angle.The diagonals are congruent.