mathematics crossword

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