The Geometry Vocabulary Quest

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Across
  1. 6. Two sides, same but not three
  2. 7. Exactly the same size and shape
  3. 9. Diamond shape in disguise
  4. 11. Perimeter's circular cousin
  5. 13. Many sides, all connected
  6. 14. Sharp, but less than 90°
  7. 15. Shape with a uniform cross section
  8. 16. Twice the radius, straight through
  9. 17. Surface measure, often in square units
  10. 21. This can be right or obtuse
  11. 24. The longest side of a right triangle
  12. 28. Perfectly round three-dimensional buddy
  13. 29. Slanted box, one pair of parallel sides
  14. 31. Can with two matching ends
  15. 32. Flat patterns fold up into 3D shapes
  16. 34. Four-sided polygon’s formal name
  17. 36. Stop if you see this shape!
  18. 38. Lines that never seem to meet
  19. 39. Line that just touches a curve
  20. 40. Corner point where edges meet
  21. 41. Round fellow with no corners
  22. 42. segment — Line with definite ends
Down
  1. 1. Flat surface on a solid shape
  2. 2. No sides equal, no angles equal either
  3. 3. Grid point, probably on the plane
  4. 4. Honeycomb shape and more
  5. 5. Folds the angle in half, perfectly
  6. 8. Three sides, three angles to count
  7. 10. Ten sides, often missed in counting
  8. 12. Balanced halves in a mirror image
  9. 13. Fence around the shape
  10. 18. Triangle with equal sides all around
  11. 19. Slice of a circle pie
  12. 20. Straight and endless, no bends allowed
  13. 22. Same shape, different size (maybe)
  14. 23. At a right angle, standing tall
  15. 25. Two angles that add to 90°
  16. 26. Rise over run, line’s steepness
  17. 27. One pair of parallel sides on display
  18. 29. Theorem involving squares and triangles
  19. 30. Four right angles, opposite sides match
  20. 33. Equal sides, equal angles too
  21. 35. Half a diameter, from center
  22. 37. Blunt angle, larger than a right angle
  23. 40. Space inside a 3D shape