geometry crossword

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Across
  1. 3. points that lie on the same plane
  2. 4. two rays with a common endpoint
  3. 5. Two angles whose sum is 180 degrees
  4. 6. coplanar lines that do not intersect
  5. 7. part of a line
  6. 9. less than 90 degrees
  7. 12. a line that intersects two or more coplanar lines at different points
  8. 13. triangle a triangle with at least two congruent sides
  9. 15. extends in opposite directions without end
  10. 16. if and only if
  11. 18. exactly 90 degrees
Down
  1. 1. a flat surface that has no thickness and extends forever
  2. 2. Having the same measure
  3. 6. a statement that is accepted as true without proof
  4. 8. same side of the transversal and in corresponding positions
  5. 10. The number of square units required to cover a surface.
  6. 11. A part of a line, with one endpoint, that continues without end in one direction
  7. 14. noncoplanar, not parallel, dont intersect
  8. 16. when points are on the same line
  9. 17. over 90 degrees