GEOMETRY SYMBOLS

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Across
  1. 4. grad
  2. 9. line from point A to point B
  3. 11. '
  4. 12. ≅
  5. 14. ⊥
  6. 15. "
  7. 18. ~
Down
  1. 1. π
  2. 2. ||
  3. 3. arc from point A to point B
  4. 5. |x-y|
  5. 6. formed by two rays
  6. 7. °
  7. 8. infinite line
  8. 10. rad
  9. 13. Δ
  10. 16. 90°
  11. 17. line that start from point A