Bens's puzzle

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Across
  1. 4. terms that have a formal definition and can be defined using other geometrical terms.
  2. 5. the point that divides a segment into two congruent segments
  3. 6. represents by a shape that looks like a floor/wall
  4. 10. consists of two end points
  5. 11. consists of a end point a and all points ab
  6. 12. the branch of mathematics concerned with the properties and relations of points, lines, surfaces
Down
  1. 1. location in space represented by a dot
  2. 2. those terms that don't require a formal definition
  3. 3. used to determine whether a point lies on a line segment
  4. 7. has one dimension represented by a line
  5. 8. set of points that have two or more geometric figures
  6. 9. absolute value of the difference or two coordinates