Tell the difference between a trapezoid and a rhombus.

1) A trapezoid is a quadrilateral with at least one pair of parallel sides, while a rhombus must have two pairs of parallel sides (it is a special case of a parallelogram).
2) The sides of a rhombus are all equal, while a trapezoid may have all 4 sides of a different length.

A rhombus is a special kind of parallelogram, a parallelogram in which all sides are equal.
A trapezoid is a special kind of quadrilateral, a quadrilateral with at least one pair of parallel sides.

The difference is in the angles: a rhombus has two pairs of equal angles, while there are no limitations to angles of a trapezoid (the only limitation - the sum of all angles are 360 degrees).