Quadrilaterals

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Across
  1. 6. A polygon with four sides
  2. 8. To divide something into two equal parts.
  3. 10. A quadrilateral with one pair of opposite sides parallel.
  4. 13. A number flipped upside down; used with negative slopes to identify perpendicular lines.
  5. 16. Lines that intersect at 90-degree angles.
  6. 18. A quadrilateral with two pairs of parallel opposite sides.
Down
  1. 1. Figures or sides that have equal measurements.
  2. 2. A point where two sides of a polygon meet.
  3. 3. Two angles whose measures add up to 180 degrees.
  4. 4. A quadrilateral with four equal sides and four right angles.
  5. 5. The point exactly halfway between two endpoints.
  6. 7. A measurement that describes the steepness of a line.
  7. 9. Describes a trapezoid with congruent legs.
  8. 11. A parallelogram with four congruent sides.
  9. 12. Line segments connecting opposite vertices of a quadrilateral.
  10. 14. A parallelogram with four right angles.
  11. 15. A quadrilateral with two pairs of adjacent congruent sides.
  12. 17. Lines that never intersect and have equal slopes.