mathematics crossword

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Across
  1. 4. operators grouped together
  2. 7. size of a surface
  3. 10. represent numbers and quantities in formula
Down
  1. 1. with points,lines,shapes and space
  2. 2. space between two intersecting lines
  3. 3. symbol for a number we don't know yet
  4. 5. ratio of a circle's circumference to its diameter
  5. 6. values of two mathematical expressions
  6. 8. straight line
  7. 9. amount of 3-dimensional space an object occupies