The Geometry Vocabulary Quest

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