basic goemetrical ideas

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Across
  1. 6. two lines have one common point
  2. 8. simple closed curve made up of line segments
  3. 10. curve which is closed
Down
  1. 1. four sided polygon
  2. 2. curve which is open
  3. 3. lines which do not meet
  4. 4. distance around the circle
  5. 5. region of circle enclosed by an arc and a chord
  6. 7. line segment joining any two points of the circle
  7. 9. region of circle enclosed by an arc and pair of radii