A rhombus has 2 pairs of parallel sides whereas a trapezoid has only 1 pair of parallel sides of different lengths
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A triangle has 3 vertices, a rhombus has 4. All sides of a rhombus are of equal length, they need not be for a triangle. A triangle is a rigid shape, a rhombus is not.
A rhombus has all four sides of equal length, a trapezium may have none. A rhombus has two pairs of parallel sides, a trapezium has one. A rhombus has two pairs of equal angles (opposite angles), a trapezium may have none.
A trapezium has only one pair of parallel sides. A parallelogram has two pair of parallel sides. A rhombus is an equilateral parallelogram - that is, a parallelogram with equal sides.
trapeziod or trapezium
All 4 sides of a rhombus must be equal, otherwise it's not a rhombus.