Geometric symbols

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Across
  1. 2. ∆
  2. 4. π
  3. 6. rad
  4. 8. arcminute,1°=60'
  5. 9. line start from point A
  6. 10. ~
  7. 11. Formed by two rays
  8. 13. infinite line
  9. 14. arcsecond,1°=60"
  10. 15. =90°
Down
  1. 1. grad
  2. 3. line from point A to point B
  3. 5. ||
  4. 7. Distance between points X and Y
  5. 12. °