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Every side is parallel to the one that doesn't touch either end of it.
A triangle, as it only has three lines and the only two that are possible touch at the top.
1 pair of parallel sides mean 1 pair of non-intersecting lines for example, squares, their lines don't touch when they up or down.
Two lines that run in the same direction that will never cross or touch. the equal sign is an example ====
First identify which are the long sides. Paper can be held either in portrait or landscape position. In portrait, the longer sides are the sides, and the shorter sides are the top and bottom. In landscape, it is the opposite. Since your question didn't indicate portrait or landscape, I will give the directions for portrait. For landscape, just turn the paper so that the longer sides are top and bottom. For portrait, make sure that the longer sides are at the sides. Now fold the paper so that the longer sides touch, then press the paper to make a crease along the fold. For landscape, fold the paper so that the shorter sides touch, and press the paper to make a crease along the fold.