Geometry crossword puzzle

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Across
  1. 2. line crosses through the center of a circle
  2. 4. half of the diameter
  3. 5. used to find the area of a circle
  4. 8. (pi)r^2
  5. 10. change in y over change in x
  6. 12. exactly the same
  7. 13. a rectangle with 4 equal sides
  8. 15. lines that do not intersect
  9. 16. angle with its vertex at the center
  10. 17. parallelogram with 4 equal sides
  11. 19. lines that meet and form right angles
Down
  1. 1. angles that are exactly the same
  2. 3. angle that is 90 degrees
  3. 6. length times width
  4. 7. distance around a circle
  5. 9. all of the sides added
  6. 11. area of base times height
  7. 14. 5 sided polygon
  8. 18. side of a triangle opposite of right angle