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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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9y ago
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9y ago

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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Related questions

What is the diameter of a circle whose circumference is 314?

The diameter of a circle whose circumference is 314 is about 1 (99.95).


What is the diameter of a circle if the circumference 314 feet?

Diameter = 314/pi feet


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What is the circumference of a circle with a 10 cm radius?

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What is the radius of a circle that has a circumference of 314 inches?

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Circumference of a circle with a diameter of 100 feet?

The circumference of a circle can be calculated using the formula C = πd, where C is the circumference, π is a constant approximately equal to 3.14159, and d is the diameter of the circle. In this case, the diameter is 100 feet, so the circumference would be C = π(100) = 314.159 feet.


How do you get the radius of the circle with the circumference?

divide the circumference by pie (3.14) and the answer would be the radius. for example circumference = 314 pie = 3.14 so 314 divide by 3.14 = 100 so the radius = 100


If the diameterof a circle is 10cm what is the circumference?

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What is the circumference of a circle with a diameter equaling with 7 centimeters in length use 314 for pi?

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What is circumference of circle that is 10 centimeters?

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How do you get the circumference out of the area?

you divide by pi (3.14) then take the square root, then multiply by 2 and multiply by pi (3.14)...in that order i.e. if you have a circle with area of 314 square inches, you take the 314 and divide by 3.14...you get 100...then you take the square root of 100...you get 10...then you multiply by 2...you get 20...then you multply by 3.14...you get 62.8 inches...thats the circumference of a circle with an area of 314 square inches