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  • 3.14 is an approximation of the ratio of the diameter to the circumference of a circle and accurate enough for most everyday purposes.
This ratio is an irrational number, meaning it cannot be expressed exactly as a common fraction, consequently is cannot be expressed as an exact decimal number. It is known in mathematics by the Greek letter Pi. There are several such Irrational Numbers which have specific names given to them.
If you know the diameter of any circle multiplying it by Pi (3.14) will give you the circumference.

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Because it is the value of pi rounded to 3 significant figures.

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Q: Why is 3.14 used when finding the circumference of a circle?
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