Number Plane and Transformations

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Across
  1. 1. Converting one language into another.
  2. 4. Two lines crossing at right angles.
  3. 5. (x,y)
  4. 9. The number plane split into four parts.
  5. 11. A dot.
  6. 13. The centre of the number plane.
  7. 15. To open a door, turn the knob in this direction.
  8. 17. Moving something clockwise or anticlockwise.
  9. 18. Up/down direction.
  10. 19. Pessimistic.
Down
  1. 2. The begining, first.
  2. 3. A flying transport vehicle.
  3. 5. Another name for the number plane.
  4. 6. The direction to loosen a screw with a screwdriver.
  5. 7. Optimistic.
  6. 8. To change.
  7. 10. Mirror.
  8. 12. Left/Right direction.
  9. 14. The worth of something.
  10. 16. Piece of furniture with four legs.
  11. 20. Most books have lines, but in maths we use a special kind of book.
  12. 21. A transformed shape or point.