Geometry symbols

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