Coordinate Geometry

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Across
  1. 2. When three or more points lie on a straight line
  2. 4. Halfway between the two end points
  3. 5. A straight line which is perpendicular to the straight line which just touches the curve at a given point
  4. 8. Rate of change
  5. 10. Crossway
  6. 13. Geometry using the coordinate points
  7. 17. Lines that could go on forever without touching
  8. 18. The distance from the edge of the circle to the center
Down
  1. 1. Lines that meet at a 90 degree angle
  2. 3. A^2 + B^2 = C^2
  3. 6. Location
  4. 7. The vertical plane
  5. 9. Another name for the coordinate plane
  6. 11. A straight one-dimensional figure having no thickness and extending infinitely in both directions
  7. 12. A closed, two-dimensional curved shape
  8. 14. The distance from one edge of a circle to another passing through the center point in a straight line
  9. 15. A straight line which just touches the curve at a given point
  10. 16. The horizontal plane