math math

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Across
  1. 1. 5-3=2,the "-"
  2. 5. the line in △,someone in the middle,someone outside.
  3. 6. 3×4=12,the "×".
  4. 7. 3×4=12，the "4".
  5. 8. How many square centimeters of iron can make a box？
  6. 10. πr²=_____.
  7. 12. 2+3=5,the "2" and the "3".
  8. 14. 12÷4=3,the "÷".
Down
  1. 2. 5-3=2,the "2".
  2. 3. three_____can constitute a triangle.
  3. 4. 12÷4=3,the "4".
  4. 9. 2+3=5,the "+".
  5. 11. the point in the line's middle.
  6. 13. square have four ____.