Area of a Circle

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Across
  1. 1. 3.14159265359
  2. 4. a circle split in half
  3. 6. The distance across a circle
  4. 7. a circle with a radius of 10
  5. 8. a circle with a radius of 4
  6. 10. The distance inside a circle
  7. 11. a circle with a radius of 2
  8. 12. the whole distance of a circle inside and across
Down
  1. 1. the distance around a circle
  2. 2. a branch of knowledge including angles, shapes, and lines
  3. 3. An educated guess
  4. 5. a subject including numbers, addition, subtraction, ETC
  5. 7. a number times itself
  6. 9. a polygon that is completely round