Geometry Symbols

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Across
  1. 2. constant π
  2. 3. angle ∡
  3. 7. °
  4. 8. | |
  5. 10. ∆
  6. 12. grad
  7. 13. to ≅
  8. 14. prime "
Down
  1. 1. ~
  2. 4. ∠
  3. 5. angle ∟
  4. 6. angle ∢
  5. 7. |x-y|
  6. 9. rad
  7. 11. '