Logic and reasoning

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Across
  1. 3. this is the then part of a conditional statement using the letter q
  2. 5. two lines intersect at this place
  3. 6. angles whose sum is 90
  4. 8. a statement that has an if and a then parts
  5. 9. this is the if part of a conditional statement using the letter p
  6. 11. angles whose sum is 180
  7. 13. angles that are less than 90
  8. 14. angles that are greater than 90 and less than 180
  9. 15. an angle whose measure is 90
Down
  1. 1. a statement that contains an if and only if statement
  2. 2. collection of all input values
  3. 3. this is when we exchange the hypothesis with the conclusion
  4. 4. two points determine this
  5. 7. three non-collinear points create this
  6. 10. this is when we negate or make false the conditional statement
  7. 11. an angle whose measure is 180
  8. 12. collection of all output values