Foundations of Geometry

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Across
  1. 4. is obtained by negating both the hypothesis and the conclusion of a conditional
  2. 5. an if-then statement that relates to a hypothesis, the part that follows if, to a conclusion the part that follows then
  3. 7. two lines that intersect at right angles
  4. 9. an infinite number of points and lines on a flat surface that extend without end
  5. 11. an infinite number of points on a straight path that extends in opposite directions with no end
  6. 12. reverses the hypothesis and the conclusion of a conditional
  7. 13. having the same measure
  8. 18. a line that intersects two or more lines at distinct points
  9. 19. angles that lie on the same side of the transversal and interrelated positions
  10. 20. a location with no size
  11. 21. the sum of two angles measure 90°
Down
  1. 1. the information about the problem that is assumed to be true
  2. 2. two lines that lie on the same plane and don't intersect
  3. 3. the sum of two angles measure 180°
  4. 6. similar to a conjecture and it is something that you think might happen based on what you observe
  5. 8. what you think might happen or might be true based on what you have observed
  6. 10. the existence or occurrence of another of another, as "A if and only if B"
  7. 14. is a statement that has the opposite meaning of the original statement
  8. 15. a statement that is assumed to be true
  9. 16. an arrangement of ordering
  10. 17. an example showing that a statement is false