Geometry symbols

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