when a system is partly changed over using half the old and half the new system for reasurance
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Yes. A rhombus is parallel. Or also called a parallelogram. It's parallel because it is a quadrilateral with 4 parallel sides.
The parallel sides of a polygon are sides that are segments of parallel lines. A polygon need not have any parallel lines. A triangle, for example, is a polygon that cannot have parallel lines.
A square has four parallel sides (two pairs of parallel sides).
no parallel lines
They are parallel to each other.