cube has 6 sides so 3 cubes have 3*6 = 18.
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Infinitely many. Polygons with 6 or more sides can have 3 pairs of parallel lines. Polygons with 7 or more sides can have a set of three parallel lines.
A trapezoid has four sides, one set is parallel.
Do you mean a trapezoid? If so it has 4 sides and 1 set of parallel . ( 2 lines are parallel ) .
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A set of three numbers.A set of three numbers.A set of three numbers.A set of three numbers.