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A trapezoid has only 1 pair of parallel sides of different lengths
Trapezoid
Parallel
All quadrilaterals except parallelogramshave less than 2 pairs of parallel sides.
If you can find the slope of both lines, then yes you can tell. The slope for parallel lines is the same - so if your slopes are the same, your lines are parallel. If you are measuring (less exact) the lines will be the same distance apart everywhere.