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Across
  1. 6. Negate both parts of a conditional statement.
  2. 7. Not parallel, not intersecting, different planes.
  3. 8. Transitive
  4. 11. A math rule accepted without proof.
  5. 14. Never meet always the same distance apart.
  6. 16. Flip the hypothesis and conclusion.
  7. 17. Flip and negate a conditional statement.
  8. 20. Planes that never touch.
  9. 21. A statement proven using logic.
  10. 22. Opposite angles formed by two intersecting lines.
  11. 23. Opposite sides of a transversal, inside parallel lines.
  12. 24. Intersect at a 90° angle.
Down
  1. 1. One case that disproves a statement.
  2. 2. An educated guess in math.
  3. 3. The final statement in a logical argument.
  4. 4. "If-then" logic rule.
  5. 5. Opposite sides of a transversal, outside parallel lines.
  6. 7. Two angles summing to 180°.
  7. 9. The opposite of a statement.
  8. 10. The "if" part of an if-then statement.
  9. 12. "If and only if" statement.
  10. 13. Two adjacent angles adding to 180°.
  11. 15. A thing is always equal to itself.
  12. 18. If a = b, then b = a.
  13. 19. Rise over run in a graph.