algebra symbols

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Across
  1. 4. ∆ABC~ ∆XYZ
  2. 6. |x-y|
  3. 7. ⊥
  4. 9. angle ABC = 30°
  5. 11. 1 turn = 360deg
  6. 13. 3.141592654...
  7. 16. grads angle unit
  8. 18. to equivalence of geometric shapes and size
  9. 19. prime α = 60°59′59″
Down
  1. 1. angle AOB = 30°
  2. 2. segment line from point A to point B
  3. 3. line that start from point A
  4. 5. triangle shape
  5. 8. arc from point A to point B
  6. 10. rad
  7. 12. angle ∟
  8. 14. arcminute, 1° = 60′
  9. 15. infinite line
  10. 17. formed by two rays