There are two definitions of a trapezoid -- restricted and unrestricted. Both definitions require one pair of sides be parallel. The restricted definition requires that only one pair of sides be parallel. So, . . .
Under the restricted definition a rectangle or parallelogram isn't a trapezoid, but under the unrestricted definition it is.
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The parallel sides of a trapezoid are the two bases
The parallel sides of a trapezoid are of different lengths.
Called an Isosceles trapezoid when the sides that aren't parallel are equal in length.
A trapezoid only has one pair of parallel sides. The other sides intersect so they are not parallel.
A trapezoid will always have I pair of opposite parallel sides of different lengths.