Geometry symbols

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