A line can be leased as either a 2-wire (1-pair) line or a 4-wire (2-pair) line.
A 2-pair line uses 1 pair to transmit and 1 pair to receive.
With a 1-pair line, you transmit and receive over the same pair of wires.
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Four pairs, which intersect at the four vertices!
there are two pairs of parrell lines in a trapizoid, the top line and bottom line. I hope I answered your question!!=)=)
NoneOctagon hasn't got any pairs of parallel line
The coordinates of the corners of a polygon, the locus of curves, and many many other possibilities. In fact, ordered pairs that form a line are the exceptions.
2 pairs of parallel lines.