COORDINATE GEOMETRY

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Across
  1. 2. Rene Descartes published a book called 'La ______'
  2. 3. X axis
  3. 5. The coordinate axes divide the plane into 4 parts called ________.
  4. 7. Y axis
  5. 8. Point with coordinates (0,0)
Down
  1. 1. French mathematician of the seventeenth century.
  2. 4. In the fourth and first quadrants the abscissa of a point is ________.
  3. 6. The measures of the angle between coordinate ________ is 90 degree.