"Earth-Measuring" Words

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Across
  1. 3. Part of baseball and geometry
  2. 7. Sounds like you're closed in in three dimensions
  3. 9. I equal the sum of the two non-adjacent ones
  4. 11. Hospital care ward which is also an angle
  5. 12. I fly, but I'm flat
  6. 14. Loud space?
  7. 16. Part of a line
  8. 18. It crosses the lines
  9. 21. A triangle congruence theorem, abbr.
  10. 23. An angle which is never wrong or left
  11. 24. Like 30 Down but you're cutting corners continually
  12. 25. Not 2 Down
  13. 26. A scheme that sounds three-dimensional
  14. 29. "Degrees, you say?" "No way!"
  15. 31. An angle and a sexual orientation
  16. 33. A triangle congruence theorem, abbr.
  17. 34. "Prove it!" "No way!"
  18. 35. Part of a line
  19. 36. Think this property over carefully
Down
  1. 1. "Nice angle," for instance, written by a poor speller
  2. 2. Whatchamacallit in a triangle
  3. 4. Part of a circle
  4. 5. A toy AND a quadrilateral
  5. 6. "Stupid" angle
  6. 8. Bad or on the bottom
  7. 10. The title of this crossword puzzle is this word's etymology
  8. 13. Squares have it, but not lines
  9. 15. Quadrilateral with four equal sides
  10. 17. Twice 28 Down
  11. 19. "Think about it as a mirror."
  12. 20. End of a famous formula, after 'Pi r'
  13. 22. Not quite identical
  14. 27. Distance between the parallel sides of a trapezoid
  15. 28. Half of 17 Down
  16. 30. Just go all the way around
  17. 31. Part of a circle
  18. 32. "Let me make you 31 Across"
  19. 33. _____ area