Pi and the Size of the Universe

How many digits of pi would you need to accurately express the circumference of the universe? A mathematician attempts to answer this question in a Numberphile "Pi" video. It turns that only 39 digits are necessary to determine the circumference of the universe that is accurate to a hydrogen atom.

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Instructional Ideas

  • Team up with an astronomy teacher
  • Provide viewers with cloze notes to jot down information
Classroom Considerations

  • Learners should be familiar with circumference and pi
Pros

  • Shows step-by-step work of the results
  • Includes some interesting information about the history of finding digits of pi
Cons

  • None