Geometric Logic and Reasoning

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Across
  1. 2. when the statement and converse are both true
  2. 3. the part of the if-then after the word "then"
  3. 4. what vertical angles must be
  4. 7. lines that never cross
  5. 8. angles that have a sum of 90 degrees
  6. 10. angles that have a sum of 180 degrees
  7. 11. the reverse of an if-then statement (also a shoe brand)
  8. 12. the reasoning used to make conjectures
  9. 13. an educated guess
Down
  1. 1. it proves a conjecture is wrong
  2. 5. the part of the if-then after the word "if"
  3. 6. numbers that can only be divided by 1 and themselves
  4. 9. lines that intersect at a 90 degree angle