Geometry crossword

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Across
  1. 1. / an infinite set of points woth a beginning
  2. 3. revolution / a type of an angle which has 360°
  3. 4. / a set of points in order so one of them is the begginning and another is its end
  4. 10. / points which can be connected with one straight line
  5. 11. / when a line connecting two random points in a figure is always inside that figure
  6. 14. / the point where two arms of an angle meet
  7. 16. / a polygon that has 5 sides
  8. 18. / a polygon that has 8 sides
Down
  1. 2. / a type of an angle which has more than 0° and less then 90°
  2. 5. / when a line connecting two random points of a figure doesn't have to be fully inside that figure
  3. 6. / a type of an angle which has 90°
  4. 7. / when two lines will never cross each other
  5. 8. / when a whole figure can be inside a circle
  6. 9. / the the result of transformation
  7. 12. / a line that crosses a segment in the middle
  8. 13. / a set of points that has beginning and end
  9. 15. / a type of an angle which has more than 90° and less than 180°
  10. 17. / a polygonthat has 9 sides