Geometry

12345678910
Across
  1. 3. '⌒'
  2. 4. C
  3. 6. line that start from point A
  4. 7. °
  5. 9. infinite line
  6. 10. 90°
Down
  1. 1. ||
  2. 2. Δ
  3. 5. formed two rays
  4. 8. constant - 3.141592654...