Crossword piZone 2013

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Across
  1. 2. A way to count part of something
  2. 4. The size of a surface a = π r2
  3. 5. Like fractions because they count part of something
  4. 6. The distance around a circle (perimeter) C = π d
  5. 9. A plane shape bounded by a continuous line that is always the same distance from the center
  6. 11. Ratio of the circumference of a circle to its diameter π = C/d
  7. 13. The relation between two or more values
  8. 14. A decimal number whose number goes on forever without repeating
Down
  1. 1. The straight line passing from one side of the circle to the other
  2. 3. Half the diameter of a circle r = d /2 r = C/2π
  3. 7. The study of numbers, patterns, space, and change
  4. 8. Formed by taking 2 circles, putting one above the other, and wrapping a surface around to connect the edges
  5. 10. A three dimensional circle
  6. 12. The amount of space inside of something like a sphere