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A prism.
A square pyramid has 1 more face than a tetrahedron. A tetrahedron has 4 faces (equilateral triangles), while a square pyramid has 5 faces (4 triangles and 1 square base). Therefore, the square pyramid has one additional face compared to the tetrahedron.
A trapezoid has one pair of parallel sides. They are opposite parallel lines of different lengths.
1 pair of parallel lines
It is possible for a hexagon to have one pair of parallel sides. A hexagon can have 0, 1, 2 or 3 pairs of parallel sides, and can have 0, 2, 3, 4, 5, or 6 parallel sides.