What is the “formal” definition of pi?

general knowledge math & puzzles

  1. the surface area of a sphere of diameter 22/7

  2. 3.1415926

  3. the ratio of a circle’s diameter to its circumference.

  4. the ratio of a circle’s circumference to its diameter

  5. the ratio of a circle’s circumference to its radius.

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Correct Option: D

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