Geometry symbol names by Ibanez

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Across
  1. 2. ⊥
  2. 4. AB
  3. 9. '
  4. 12. π
  5. 13. ∟
  6. 14. |x-y|
Down
  1. 1. ∥
  2. 3. °
  3. 5. ~
  4. 6. Δ
  5. 7. c
  6. 8. ∠
  7. 10. ≅
  8. 11. "