what is a trapezoid and a rhombus
Never, if your books says the definition of a trapezoide is 'exactly' one set of parrallel sides, since a rhombus has two sets of parallel sides. And B. Sometimes, if your book doesn't clarify what the exact definition of a trapezoid is ^_^. Always, if your book says the definition of a trapezoid is that it has 'at least' one set of parallel sides, since a rhombus has two sets of parrallel sides. Most textbooks definite trapezoids this way.