GEOMETRY SYMBOLS

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Across
  1. 4. ′
  2. 5. grad
  3. 7. ∥
  4. 8. ∠
  5. 10. ⊥
  6. 13. π
  7. 14. ≅
  8. 15. |x-y|
Down
  1. 1. Δ
  2. 2. ~
  3. 3. °
  4. 6. rad
  5. 9. infinite line
  6. 11. line that start from point A
  7. 12. ″