Geometry Puzzle

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Across
  1. 2. formula
  2. 6. the middle of a line segment
  3. 7. a statement that can be proven
  4. 8. straight lines that never meet
  5. 12. Quadrilateral with four equal sides
  6. 13. angles that are vertical from each other when lines cross
  7. 15. example a special case for a proposed general principle and regularly shows up as an illustration
  8. 16. where the three medians of the triangle meet
  9. 18. triangle means two legs
  10. 19. L•W=
  11. 20. two adjacent angles that make a line
Down
  1. 1. an explanation that is acknowledged without evidence
  2. 3. line that proportionally splits the triangle into two segments
  3. 4. lines line that run straight through each other
  4. 5. has 4 straights sides and the opposite sides are parallel
  5. 9. ABC ≈ A’B’C’
  6. 10. 5 letter word starting with a and end with e
  7. 11. angle measures 90°
  8. 14. angle this angle measures lower than 90°
  9. 16. C= 2(pi)(r)
  10. 17. a shape that has 10 sides