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Across 3. a parallelogram with four right angles 7. a polygon with all angles congruent 8. a quadrilateral with exactly one pair of parallel sides 9. a parallelogram with four congruent sides 12. the nonparallel side of a trapezoid 13. a quadrilateral with both pairs of opposite sides parallel 14. a parallelogram with four congruent sides and four right angles 16. a trapezoid with legs that are congruent 17. do not share a side

Down 1. the segment that joins the midpoints of its legs 2. the two angles that share a base of a trapezoid 4. a polygon with all sides congruent 5. angles of a polygon that share a side 6. a polygon that is both equilateral and equiangular 10. do not share a vertex 11. the parallel sides of a trapezoid 15. a quadrilateral with to pairs of consecutive sides congruent and no opposite sides