Coordinate Geometry

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Across
  1. 5. Ordered pair locating a point
  2. 8. Length between two points
  3. 10. Point exactly halfway between two points
  4. 11. X-coordinate of a point
  5. 12. Point where medians of a triangle meet
Down
  1. 1. Points lying on the same straight line
  2. 2. Line dividing a segment into two equal parts
  3. 3. Y-coordinate of a point
  4. 4. Fixed point (0,0) on the plane
  5. 6. Reference line for measurement
  6. 7. Measure of tilt of a line
  7. 9. One of four regions in the plane