Geometry symbol

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Across
  1. 2. °
  2. 4. '
  3. 7. π
  4. 10. formed by two rays
  5. 12. ~
  6. 14. ∆
  7. 15. ||
Down
  1. 1. ⊥
  2. 3. |x-y|
  3. 5. radians
  4. 6. "
  5. 8. 90°
  6. 9. c
  7. 11. g
  8. 13. grads angle unit