Geometry Crossword puzzle

123456789101112131415161718192021
Across
  1. 2. of concurrency
  2. 6. point
  3. 8. Angle Inequality theorem
  4. 10. concurrency for the medians of a trangle
  5. 11. and Division Properties
  6. 14. segment that divides an angle or a side into two parts of equal measures
  7. 15. that the conclusion is false
  8. 17. three, or more lines intersect at a common point
  9. 18. Property
  10. 19. an angle is an exterior angle of a triangle, then a measure is greater that the measure of either of its corresponding remote interior angles.
  11. 21. Inequality theorem
Down
  1. 1. by Condradiction
  2. 3. and Subtraction Properties
  3. 4. sum of the lengths of any two sides of a triangle is greater than the length of the third side
  4. 5. c>a and a<b, then ac<bc and a/c<b/c
  5. 7. point of intersection
  6. 8. Property
  7. 9. reasoning
  8. 11. bisector
  9. 12. point of the altitudes of a triangle
  10. 13. indirect proof in which one assumes that the statement to be proved is false
  11. 15. or a>b
  12. 16. lines
  13. 18. proof
  14. 20. assumes that the statement to be proved is false