Geometry Puzzle

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Across
  1. 2. straight one-dimensional figure that extends infinitely in opposite directions
  2. 5. Guess based on patterns
  3. 6. two segments that meet at right angles
  4. 10. exactly 90 degrees
  5. 15. If NOT Conclusion, then NOT Hypothesis
  6. 16. If angle a equals 81 degrees and angle b equals 99 degrees then they are?
  7. 17. swapping hypothesis and conclusion
  8. 19. statement that is assumed true without proof
  9. 20. less than 90 degrees
Down
  1. 1. formed by two rays or line segments that share a vertex
  2. 3. two angles whose measures add up to 90 degrees
  3. 4. a triangle where all three sides have different lengths and all three angles have different measures
  4. 7. figures with the same size and shape
  5. 8. A point that is in the middle of a line that divides it into two equal partsConjecture guess based on patterns
  6. 9. A statement that has an opposite meaning of a given statement
  7. 11. If not a, then not b
  8. 12. divide a figure into two equal parts
  9. 13. True statements that can be proven
  10. 14. starts at a point and extends in one direction infinitely
  11. 18. more than 90 degrees