A parallelogram<span> is a </span>quadrilateral<span> with opposite </span>sides parallel. A quadrilateral<span> with equal </span>sides<span> is </span>called<span> a </span>rhombus<span>, and a </span>parallelogram<span> whose angles are </span>all<span> right angles is </span>called<span> a rectangle.
I don’t fully understand what you’re asking, but I would say, taking a guess on what you asked, the sides are called parallel lines, assuming that’s what you’re asking for.
