Spelling #9

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Across
  1. 3. An angle less than 90 degrees
  2. 6. The state of being stretched tightly
  3. 9. A force acting on the inside of an object
  4. 11. A force acting on the outside of an object
  5. 13. An action that changes the shape of something
  6. 14. Usually the longer side of a shape
  7. 15. A measurement used to measure angles starting from 0
  8. 16. A triangle with two same angles and two same edges
  9. 18. Animal or nature made
  10. 20. The outside of a shape, calculated by adding up all the edges
Down
  1. 1. Putting pressure on it from different sides until it breaks or gets smaller
  2. 2. An angle greater than 90 degrees
  3. 4. A twist on an object
  4. 5. A push or a pull
  5. 7. A shape with two sets of parallel lines
  6. 8. Where two lines meet
  7. 10. Usually the shorter side of a shape
  8. 12. The amount of space between two intersecting lines
  9. 17. A 3D object that is strong, stable, and free-standing
  10. 19. People-made