Giant Geometry Crossword

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Across
  1. 2. polygon with 4 sides
  2. 6. polygon with 12 sides
  3. 8. polygon with 3 sides
  4. 9. adding to 90 degrees
  5. 12. the longest side in a right angled triangle
  6. 13. polygon with 7 sides
  7. 15. devised a rule for finding the third side of a right angled triangle from two other sides
  8. 16. same shape but different size (scaled up or down, may be rotated or reflected)
Down
  1. 1. same shape and size (may be rotated or reflected)
  2. 3. polygon with 11 sides
  3. 4. polygon with 10 sides
  4. 5. to cross over (i.e. crossing lines)
  5. 7. adding to 180 degrees
  6. 10. polygon with 9 sides
  7. 11. polygon with 5 sides
  8. 14. the branch of mathematics relating to triangles
  9. 15. always the same distance apart and never touching