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How to calculate the circumference of a circle 
Write down the formula for finding the circumference of a circle using the diameter. 
The formula is simply this :. In this equation, " c " represents the circumference of the circle, and " d " represents its diameter.
That is to say, you can find the circumference of a circle just by multiplying the diameter by pi. Plugging π into your calculator will give you its numerical value, which is a closer approximation of 3.14 or 22/7.