Kahlil's awesome crossword puzzle

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Across
  1. 1. The amount of 3-dimensional space an object occupies.
  2. 3. 3.14
  3. 4. the part of mathematics in which letters and other symbols.
  4. 5. The space between two intersecting lines.
  5. 7. A numerical or constant quantity.
  6. 9. A statement that the values of two mathematical expressions are equal.
Down
  1. 2. Numbers, symbols and operators.
  2. 6. A special relationship between values
  3. 8. Tendency an average of a data set.
  4. 10. The size of a surface.