Geometry

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Across
  1. 2. (x,y) -> (y,-x)
  2. 4. (x,y) -> (-y,x)
  3. 7. (3,4) -> (-4,3)
  4. 9. <3,7>
  5. 11. (4,6) -> (4+2,6-4)
  6. 12. (3,4) -> (3+2,4-1) -> (-5,3)
Down
  1. 1. (x,y) -> (-x,-y)
  2. 3. ABC≅ DEF
  3. 5. (x,y) -> (-x,y)
  4. 6. Reflections, translations and reflections are this
  5. 8. (x,y) -> (x,-y)
  6. 10. (2,4) -> (2,-4)