Math fun

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Across
  1. 3. transformation of an object
  2. 5. smaller than 90 degrees
  3. 9. a^2 + b^2 = c^2
  4. 11. line passing through the center of a circle
  5. 12. a straigt line
  6. 13. Bigger than 90 degrees
  7. 14. opposite over hypotenuse
  8. 16. total of space inside an object
  9. 17. 90 degrees
  10. 18. Boundary of an object
  11. 19. the surface of an object
Down
  1. 1. line from the center of a circle to the edge
  2. 2. number an object is changed by
  3. 4. a foldable shape to make a solid object
  4. 6. opposite over adjacent
  5. 7. adjacent over hypotenuse
  6. 8. line on a graph that makes a right∠
  7. 9. same slope but different y intercept
  8. 10. the crust of a circle
  9. 15. acrost from an angle