Geometry crossword

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Across
  1. 1. two angles that add up to 180 degrees
  2. 4. a point at the end of a segment
  3. 5. if you just see P on a line what is it called
  4. 9. any side of a triangle
  5. 11. two angles that have the same measure is called what
  6. 13. the start of a line that continues forever in one direction
  7. 14. what angle is 90 degrees
  8. 15. an angle that equals 180 degrees
  9. 18. not defined with the use of figures
  10. 19. less than 90 degrees
  11. 20. a line with two endpoints
Down
  1. 2. it extends forever and ever
  2. 3. two angles that add up to 90 degrees
  3. 6. point in the same plane
  4. 7. half of the diameter
  5. 8. distance around the circle
  6. 10. a figure formed by two rays
  7. 12. what angle is more than 90 degrees
  8. 16. the sum of the sides of the figure
  9. 17. a flat surface that goes on forever