What is the best name for the figure with vertices at the following coordinates? (0,0), (-1, 1), (6, 1), and (2, 0)

The segment from (−1, 1) to (6, 1) is horizontal, and the segment from (2, 0) to (0, 0) is also horizontal, so these opposite sides are parallel. The other pair of sides is not parallel: their slopes are −1 and 1/4. A quadrilateral with one pair of parallel sides is a trapezoid, so the best answer is trapezoid.

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