Geometry symbols

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Across
  1. 3. c
  2. 5. π
  3. 6. g
  4. 8.
  5. 9. Δ
  6. 11. formed by two rays ∠
  7. 12.
  8. 14. → or ←
  9. 15.
Down
  1. 1.
  2. 2.
  3. 4. °
  4. 7. ~
  5. 10. |x-y|
  6. 13.