geometry puzzle

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Across
  1. 2. flat surface made up of two points that has dimensions and extends without end and represented by a slanted four sided figure
  2. 4. points that lie on the same plane
  3. 6. point that divides a segment into two congruent segments
  4. 8. terms that can be described using known words
  5. 10. rule that is accepted without proof
  6. 13. location in space that is represented by a Dot and has no dimension
  7. 14. points that lie on the same line
  8. 15. endpoint of two rays that have the same endpoint
Down
  1. 1. angle that has a measure of 180
  2. 3. consists of two end points and all the points between
  3. 5. ray that divides an angle into two angles that are congruent
  4. 7. set of two or more geometric figures
  5. 9. points that represent the ends of a line segment or ray
  6. 11. has one dimension. it is represented by a line with two arrowheads but it extends without end
  7. 12. rule that is accepted without proof
  8. 16. consists of the end point a and all points on ab that lie on the same side