Geometry

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Across
  1. 3. line that start from point A
  2. 6. infinite line
  3. 7. 3.141592654...
  4. 9. 90°
  5. 10. formed two rays
Down
  1. 1. °
  2. 2. C
  3. 4. '⌒'
  4. 5. ||
  5. 8. Δ