Math Crossword Puzzle

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Across
  1. 3. a round shape
  2. 5. half a diameter
  3. 6. distance across a circle
  4. 8. a negative or positive number
  5. 11. the distance around a noncircular shape
Down
  1. 1. a 3D circle
  2. 2. distance around a circle
  3. 4. a number that does not terminate or repeat
  4. 7. the ratio of a circle's circumference to diameter
  5. 9. pi is the 16th letter of the _____ alphabet
  6. 10. a comparison of two quantities