Maths Crossword puzzel

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Across
  1. 3. line which has one end point
  2. 4. An integer which is less than zero.
  3. 7. a shape that can be closed or open
  4. 8. lines which never intersect each other
  5. 10. device to measure line segment
  6. 11. all the positeve integers exept 0
Down
  1. 1. line that meet at a single point.
  2. 2. A line which has two end points
  3. 5. number with no decimal or fractional part, from the set of negative and positive numbers.
  4. 6. a polygon having four sides
  5. 9. collection of points