Math Mind Boggle

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Across
  1. 4. u
  2. 7. of a Line y=mx+b
  3. 13. to switch the hypothesis and conclusion
  4. 15. to be equal on all three sides of a triangle
  5. 17. f
Down
  1. 1. Angle
  2. 2. Lines
  3. 3. Angle
  4. 5. Planes
  5. 6. a point that divides a segment into two congruent segments
  6. 8. to negate hypothesis and conclusion
  7. 9. i
  8. 10. to have the same length,size and shape
  9. 11. the first step of proofs
  10. 12. Lines do not intersect and are not coplanar
  11. 14. end of a side
  12. 16. Angle an angle that is less than 90 degrees
  13. 18. Bisector