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