A trapezoid has one line of symmetry if it is an isosceles trapezoid. An isosceles trapezoid is a trapezoid where the non-parallel sides are of equal length. This line of symmetry runs vertically through the midpoints of the two parallel sides. However, if the trapezoid is not isosceles, it does not have any lines of symmetry. In summary, the number of lines of symmetry in a trapezoid depends on whether it is isosceles or not.
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