Coordinate geometry

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Across
  1. 4. the point of intersection of the x, y axes
  2. 5. Four parts of the plane.
  3. 6. The father of coordinate geometry.
Down
  1. 1. The other name of x-coordinate of a point.
  2. 2. The vertical line of the Cartesian plane.
  3. 3. The name for x and y axes together.