A shape that doesn't have pairs of parallel sides is a circle. This is also true of ellipses and triangles.
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It is not possible to have 1 parallel side since it must be parallel to another side. A four sided shape with 1 PAIR of parallel sides is a trapezium (or trapezoid).
The only requirement for a trapezoid is that one pair of opposite sides be parallel. There could be trapezoids with a pair of perpendicular lines.
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cones have no congruent sides cause they dont have sides
dont cross