Question: a parallelogram is a quadrilateral in which opposite sides are parallel true or false?
Answer: If a quad is a rhombus, then it is a rectangle. If the opposite sides of a quadrilateral are parallel, then it is a parallelogram. A quadrilateral is a parallelogram if one pair of opposite sides is congruent. If a quadrilateral has one pair of parallel sides, then it is a parallelogram.