co-ordinate geometry

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Across
  1. 1. the fixed point which distances are marked
  2. 3. the coordinate plane is also callled
  3. 6. system used to describe the position of a point
  4. 7. the horizontal line is called
Down
  1. 2. The study of coordinate geometry was developed by
  2. 3. abscissa is also called
  3. 4. the perpendicular distance of a point from x axis
  4. 5. name of each part formed by axis