Mathematical crossword

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Across
  1. 2. the surface of a 2D shape
  2. 6. you make something bigger
  3. 7. round the edge of an round object
  4. 8. you can simplify them and write them out in full
  5. 10. a straight line going through the middle of an object
  6. 11. a chance of an event happening
  7. 12. it is putting brackets back in
Down
  1. 1. you can simplify it
  2. 3. the amount of space inside a 3D shape
  3. 4. a number below zero
  4. 5. you do it to shapes
  5. 9. Some logos have it