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What is Circumference?

What is the formula for circumference of a circle?

Summary

  1. d is a a variable that stands for the diameter
  2. Pi or π is the ratio of the circumference to the diameter
  3. r is a variable that stands for radius
  4. The diameter is twice the radius
  5. 3.14 is the approximation we use for π
  6. Plug 9.4 in for the diameter
  7. 3.14 times 9.4 is 29.516
  8. 3.14 times 4.7 is 14.758

Notes

    1. d stands for diameter
    1. r stands for radius
    1. 3.14 is the approximation we use for π
    2. d stands for diameter
    1. 3.14 is the approximation we use for π
    2. r stands for radius