In an isosceles trapezoid, (0/1/2) pair of sides are parallel.

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Solution

An isosceles trapezoid is formed by cutting an isosceles triangle along a line parallel to the side of the triangle connecting the equal angles of the triangle.

Here, EDCB is isosceles trapezoid.
ED and BC are parallel.
BE and DC are non-parallel and equal in length.

Hence, one pair of sides are parallel.

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