math

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Across
  1. 4. x1 + x2/2 , y1 + y2/2
  2. 5. 90 degree ____
  3. 10. __ degrees
  4. 12. intersection
  5. 14. <ABC~<CBA
  6. 15. dfhofh
  7. 16. common vertex
  8. 18. if-then
Down
  1. 1. line segment joining a vertex
  2. 2. a^2 + b^2= c^2
  3. 3. A=1/2(d1 x d2)
  4. 6. A=ba
  5. 7. 1/2Pa
  6. 8. all three angles bisect
  7. 9. a line with a single endpoint
  8. 11. distance from the center of a regular polygon to the midpoint of the side
  9. 13. conclusion is negated
  10. 14. A=S^2
  11. 17. if-only