Maths words for Charlie

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Across
  1. 3. four squared
  2. 4. same shape, same size
  3. 5. unit of mass
  4. 6. quadrilateral with two parallel sides
  5. 8. perimeter of circle
  6. 12. thousand metres
  7. 13. less than ninety degrees
  8. 14. 3x + 4 = 25
  9. 17. extruded circle
  10. 19. triangle with two equal sides
  11. 22. square root of nine hundred
  12. 23. shape with no corners
  13. 25. opposite of impossible
Down
  1. 1. big angle
  2. 2. square root of eighty one
  3. 3. take
  4. 4. F angle
  5. 7. 2, 3, 5, 7, 11, 13, 17
  6. 9. four sided triangle
  7. 10. triangle with all sides equal
  8. 11. most frequent number
  9. 13. Z angle
  10. 15. triangle with all different sides
  11. 16. five sided shape
  12. 18. quadrilateral with all sides equal
  13. 20. six sided shape
  14. 21. solid shape with five faces
  15. 24. eight sided shape