Geometry puzzle- braydon

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Across
  1. 4. polygon with 5 sides
  2. 5. adds up to 90 degrees
  3. 6. lying in the same plane
  4. 8. a part of a line wuth one endpoint
  5. 10. shape with 4 sides
  6. 13. a shape with 3 sides
  7. 15. a shape with 6 sides
  8. 18. angle less the 90 degrees
  9. 19. the length of a straight line through the center of a circle
Down
  1. 1. a type of line that has 2 endpoints
  2. 2. a set of points that make a rounded shape
  3. 3. when lines cross over one another
  4. 5. They are equal
  5. 7. adds up to 180 degrees
  6. 9. always the same length apart and never touch
  7. 11. a 90 degree angle
  8. 12. a statement that can be proved
  9. 14. a parrallogram with 4 equal sides
  10. 16. the total surface area inside
  11. 17. a point of which a ray and angle meet