Delicious Pi

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Across
  1. 4. the amount of space inside a 2D shape
  2. 7. a number that represents a part of a whole
  3. 8. almost, near, around
  4. 10. the result of multiplying a number by itself
  5. 11. the ratio of a circle's circumference to its diameter (approximately 3.14)
  6. 12. multiplying by two
  7. 13. a point in the middle
  8. 15. a number that cannot be written as a fraction
  9. 16. a fraction based on parts of ten
Down
  1. 1. dividing into two equal parts
  2. 2. the root number of a square number
  3. 3. a straight line joining the centre of a circle to its edge (half the diameter)
  4. 5. a straight line through the middle of a circle
  5. 6. the distance around the outside of a circle
  6. 9. never-ending
  7. 14. a rule in maths expressed in symbols