Happy Pi Day!

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Across
  1. 4. month Pi day is celebrated
  2. 6. 3.14…
  3. 7. half of the diameter
  4. 9. pi's place in greek alphabet
  5. 10. the amount of space a 2D shape takes up
  6. 11. the measurement around the outisde of the circle
Down
  1. 1. having an infinite and non-recurring expansion when expressed as a decimal
  2. 2. a physician that was born at pi day
  3. 3. the amount of space a 3D shape takes up
  4. 5. a round-shaped figure that has no corners or edge
  5. 8. the measure of inside of the circle