NUMBER SYSTEM

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Across
  1. 2. comes from the word ratio
  2. 5. refers to vertical (v)
  3. 6. intersection of the axis
  4. 7. represents by a unique point on the number line.
  5. 9. rules of chord
  6. 10. divide the plans into four parts
Down
  1. 1. means to count
  2. 3. denoted by the symbol "Z"
  3. 4. was the first to compute digits in the decimal expansion of π
  4. 8. the great Indian mathematician and astronomer