Geometry Crossword Puzzle

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Across
  1. 3. Angles that lay on the same side of the transversal, both on the interior
  2. 5. sum of said angles is equal to 90 degrees
  3. 6. If then
  4. 8. a common side and vertex
  5. 10. Something used to prove a statement
  6. 13. an angle that measures exactly 90 degrees
  7. 14. process of reasoning from one or more statements to reach a logical conclusion
  8. 15. an angular point of a polygon or other figure
  9. 17. a line or ray that divides an angle into two congruent angles
  10. 18. if two angles form a straight angle, the sum of their measures is equal to 180 degrees
  11. 19. the exact middle point of a line segment
Down
  1. 1. sum of said angles is equal to 180 degrees
  2. 2. a pair of angles that form a straight angle
  3. 4. lying in the same straight line
  4. 7. m∠AOB+m∠BOC=m∠AOC,  the measure of the larger angle is the sum of the measures of the two smaller ones
  5. 9. said angles have a common side and a common vertex
  6. 11. an angle that measures more than 90 degrees
  7. 12. an angle that measures less than 90 degrees
  8. 15. a pair of congruent angles that are formed by two lines intersecting
  9. 16. An accepted fact or statement