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.

Concepts

pi, the universe, accuracy

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Additional Tags

math

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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

• This video is hosted on YouTube

Pros

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

Cons

• None