geometry crossword puzzle

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Across
  1. 5. length around a circle
  2. 7. makes a U shape
  3. 10. 6 equal sided shape
  4. 11. makes a 90 degree angle
  5. 13. less then 90 degrees
  6. 14. has its own holiday
  7. 16. larger then 90 degrees
  8. 17. the equation is a^2+b^2=c^2
  9. 18. continuously goes on
  10. 19. lines that never touch
Down
  1. 1. equation is(x1+x2/2,y1-y2/2)
  2. 2. area of outside of shape
  3. 3. 4 equal sides
  4. 4. fills up a shape
  5. 5. two equal shapes
  6. 6. another version of a decimal
  7. 8. intersection of two points
  8. 9. has a radius
  9. 12. angles that add up to 180
  10. 15. 2 sets of parallel sides