Geometry!

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Across
  1. 5. a four sided figure with 4 equal side lengths
  2. 7. the longest side of a right triangle
  3. 10. Plato would call this a "hexahedron"
  4. 15. a four sided figure with one pair of parallel sides
  5. 17. a four sided figure with two pairs of parallel sides
  6. 18. the distance from one side of a circle to the other, which goes through the center
  7. 20. an angle that is less than 90 degrees
  8. 21. how much three dimensional space something takes up
  9. 22. a 2D object that extends infinitely in all directions
  10. 24. an angle that is greater than 90 degrees but less than 180 degrees
  11. 26. a line that just barely touches a circle’s edge, and is perpendicular to the radius
  12. 27. a four sided figure where all angles are 90 degrees
  13. 29. a 1D object that extends infinitely in both directions
  14. 30. an angle that is 180 degrees
  15. 31. two shapes that are the same but proportional to each other
  16. 32. a triangle with two equal side lengths
Down
  1. 1. the distance around a circle
  2. 2. to cut something in half
  3. 3. how much two dimensional space something takes up
  4. 4. a location in space with zero dimensions
  5. 6. a triangle with three different side lengths
  6. 8. The ratio of the distance around a circle to twice the radius
  7. 9. a four sided figure where all sides are equal and all angles are 90 degrees
  8. 11. a platonic solid with 4 faces
  9. 12. "3-4-5" is an example of a "_____ triple"
  10. 13. a 3D shape whose bottom and top faces are congruent and parallel
  11. 14. a four sided figure with two sets of adjacent congruent sides
  12. 16. a four sided shape
  13. 19. a triangle with three equal side lengths
  14. 23. a platonic solid with 8 faces
  15. 25. an angle that is 90 degrees
  16. 28. two shapes that are exactly the same (share the same angles and side lengths)