Geometry symbols

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