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Radius is half of the diameter, so you can easily come up with a formula:

L = 0.25 * pi * d2

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Q: Formula to find circumferance given diameter?
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Related questions

What is the formula to find the circumference of a circle with the diameter given?

Circumference = (diameter) multiplied by (pi)


What is the formula to find the circumference of a circle when the diameter is given?

(pi)D


What is the formula to find circumference when you are given the radius?

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What is the formula to find volume when diameter and length are given?

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What is the diameter of a 7 circumference?

When you are given the circumference of a circle asked to find the diameter, divide the circumference by pi. The formula for circumference is pi x diameter, so the formula for diameter is circumference divided by pi. So 7 divided by pi equals about 2.22.


What is the formula to find a circumference if the radius is 3 and the diameter is 6?

The circumference of a circle is given by the formula C = 2πr where r is the radius. But, as the diameter is 2 x radius then the formula can be written C = πd where d is the diameter. In this example the circumference = 2π3 = 6π = 18.85 units.


How can you find the circumference if you know what the diameter is?

Use the formula : pi * radius * radius = circumferance. (the radius is half of the diameter).A2The above answer will give you the area, not the circumference. To get the circumference from the diameter just multiply by pi. Circumference = pi x Diameter.i agree, very ezyou know everything is not always ez pz i am in sixth grade even my mom does not know it.


Han is buying new tires for his bike. He wants to make sure the new tires will fit on his bike but the only measurement he has is the diameter of 4.0 inches. What is the circumference of the new tires in inches?

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How do you find the radius of a circle with a circumferance of 70 inches?

divide the circumference by 3.14 to get the diameter - then divide that by 1/2 to get the radius Radius = Circumference / 2 x pi from C = Diameter x pi