Q: Why do you need to know about circumference?

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As for example when constructing a round-about on a road you'll need to know its perimeter which is the circumference of a circle.

The circumference of a circle would be needed as for example when constructing a circular swimming pool.

you do not need to know the circumference to find the diameter. You just need to measure one side of the circle to the other .

Circumference is calculated by 2pr So if you know the circumference, divide by 2, and then divide by p That answer will be the radius

You need to know diameter of each circle, which are different for each circle; each circle circumference is pi x diameter where pi = 3.14159

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If you know the diameter and need the circumference you times the diameter of the circle by 3.14 also known as pie. That is how you get the circumference by only knowing the diameter. :)

As for example when constructing a round-about on a road you'll need to know its perimeter which is the circumference of a circle.

To find the diameter of a circle, you will either need to know the area or its circumference. If you know the area: diameter = 2 x squareroot(area / Pi) If you know the circumference diameter = circumference / Pi

The formula for finding circumference is 2∏r (or ∏d). So to find the diameter, you would divide the circumference by pi (3.14, approximately).

The circumference of a circle would be needed as for example when constructing a circular swimming pool.

well if a builder wants to know how large a circle needs to be for a zoo or anything, he/she would use circumference. Amanda Steffey

you do not need to know the circumference to find the diameter. You just need to measure one side of the circle to the other .

Pi X D = Circumference. To find Diamater if you know Circumference, divide Circumference by Pi (3.14).

Circumference is calculated by 2pr So if you know the circumference, divide by 2, and then divide by p That answer will be the radius

If you know the circumference of a circle, you can find the radius by dividing the circumference by the value of Pi (3.14159...)

To know how fay you travel in one rotation of the wheel.

You need to know diameter of each circle, which are different for each circle; each circle circumference is pi x diameter where pi = 3.14159