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.
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trapezoid
They both have four sides. This is the only complete similarity between the rhombus and the trapezoid.
No, not every trapezoid is an isosceles trapezoid.
A trapezium is a plane figure, bounded by four straight lines. One pair of these lines is parallel, the other pair is not.
A trapezoid need not have any equal sides, but it may have some equal sides. The only requirements to be a trapezoid, is that it has 4 sides, and at least one pair of parallel sides.