MATH, Math, math. (use _ as a space

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Across
  1. 2. a triangle with one right angle.
  2. 3. a hundred tens.
  3. 5. a triangle that has one obtuse angle.
  4. 10. a thousand thousands.
  5. 12. a circle with an open place that looks like a mouth.
  6. 14. a shape with eight angles.
  7. 16. a shape with 6 angles.
  8. 17. a triangle with all sides the sane size.
  9. 22. a shape with no sides and width is different from length.
  10. 24. a quadrilateral having 2 parallel sides, both of the angles are 90 and has the same width as length.
  11. 25. kg ÷ 1000
  12. 27. 3D shape with 20 sides, each with a triangle.
  13. 30. a shape with only 2 parallel sides, it has 2 acute and 2 obtuse angles.
  14. 32. m ÷ 1000
  15. 35. a prism with a pentagon at the sides.
  16. 36. a shape with 5 angles.
  17. 38. half a circle
  18. 41. a shape that has 12 angles with no parallel sides.used in ambulance trucks.
  19. 43. a pyramid with a hexagon below and 6 triangles.
  20. 46. l ÷ 1000
  21. 47. it has no limit
  22. 48. a 3D shape being longer than wider and has its corresponding shape on the sides.
  23. 49. a shape with nine angles.
  24. 50. a 2D shape that looks like an 2D egg.
  25. 53. a circle with a slight moon-like shape.
  26. 54. a shape with 7 angles.
  27. 55. an angle exactly 180º
  28. 57. A 3d Shape with no sides, ideal shape for balls.
  29. 59. a 3D shape have any shape (except squares) and a number of triangles corresponding to the angles the shape below has.
  30. 62. half a sphere.
  31. 63. it has a limit
  32. 66. a triangle with all sides different sizes.
  33. 67. the main thing to add, subtract, multiply, divide, compare etc
  34. 68. a shape that has 8 sides, all of them with triangles.
  35. 69. how wide something is.
  36. 70. number of letters this sentence has.
Down
  1. 1. one, ten, hundred, thousand, million, billion, trillion, ?
  2. 3. 1427297869183746+92837469128764
  3. 4. a 3D shape with no sides, its length and width are different.
  4. 6. the number wich adds up to one more than 9
  5. 7. ten tens.
  6. 8. a prism with a quadrilateral at the sides.
  7. 9. a prism with a star on the sides.
  8. 11. a quadrilateral having 2 parallel sides, both of the angles are 90 and has different width and length.
  9. 13. a round shape being the same length as width.
  10. 15. a prism with a hexagon at the sides.
  11. 16. a shape having two sides and 2 angles, it has a curved angle on top and a right one down.
  12. 18. when you aggregate a number to be higher than its former self .
  13. 19. a prism with a triangle at the sides.
  14. 20. how long something is.
  15. 21. an angle less than 90º
  16. 23. a pyramid with triangles all sides.
  17. 26. a 3D shape having 6 sides and each one square, the usual shape for nothing.
  18. 28. a way to measure solid material's weight.
  19. 29. when you cut the number into the following parts of the other one.
  20. 31. a pyramid with a square below and 4 triangles.
  21. 33. how high something is.
  22. 34. a 3D shape shaped like a ring with no sides.
  23. 37. a shape with ten angles.
  24. 39. an angle exactly 90º
  25. 40. a pyramid with a pentagon below and 5 triangles.
  26. 42. a 3D shape having 3 sides, two containing circles, usual shape for cups.
  27. 44. an angle more than 90º
  28. 45. when you make exact copies of the number and then aggregate them.
  29. 51. half a cube.
  30. 52. a rhomboid having 2 parallel sides.
  31. 53. a 3D shape that has a circle below, the top is pointed.
  32. 56. a way to measure liquid material's weight.
  33. 58. when you erase a number to be lower than its lower self.
  34. 60. used to measure the length of something.
  35. 61. a shape with 1 acute angle 1 obtuse angle down, and viseversa up.
  36. 64. a shape with 10 angles, none are parallel.
  37. 65. how heavy something is.