Vocabulary of geometry

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Across
  1. 3. has a start but no end
  2. 6. sleeping line
  3. 7. angle between 90 degree and 180 degree
  4. 9. definite length
  5. 10. angles measured in
Down
  1. 1. Railway tracks
  2. 2. angle with straight back
  3. 4. The "D" of maths
  4. 5. scissor
  5. 8. angle<90degree