Circles

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Across
  1. 3. distance from the center of a circle to any point on the circle
  2. 6. pi is in what subset of the real number system
  3. 7. half of a circle
  4. 10. all points in a circle are the same distance from this point/center
  5. 12. distance across a circle through its center
  6. 13. ratio of the circumference and diameter of any circle
  7. 14. a circle has 360 of these units
Down
  1. 1. a line joining two points on the circle
  2. 2. a shape with all points the same distance from its center
  3. 4. plural for radius
  4. 5. distance around a circle
  5. 8. the shape of a circle
  6. 9. number of square units occupied by the space inside the circle
  7. 10. an instrument used to draw perfect circles
  8. 11. formula for circumference