Geometry Symbol

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Across
  1. 4. constant π
  2. 7. AB
  3. 8. "
  4. 9. °
  5. 11. grad or g, grads angle unit
  6. 14. ⊥
Down
  1. 1. ~
  2. 2. to ≅
  3. 3. ||
  4. 4. '
  5. 5. ∠
  6. 6. rad or c , radians angle unit
  7. 10. ∟
  8. 12. |x-y|
  9. 13. ∆