Q: What is the formula to measure circumference?

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Multiply the diameter times pi.

Not quite sure what you mean by "true way". You can measure it with a string or a similar flexible object. Or you can measure length and width, and - assuming it is an ellipse - use the formula for the circumference of an ellipse - or rather, an approximation formula.

No, in order to fine the arc length you need a formula which is: Circumference x arc measure/360 degrees

The formula for the circumference of a circle is the same, whatever its diameter. Circumference = pi*diameter.

Circumference = 2*pi*r r(radius) * 2 = diameter So. assuming the bottle is fairly a circle, measure across the bottom to get the diameter and then divide that in half for the radius and use the circumference formula. Of course a bottle is not quite a perfect circle everywhere and you might need calculus to get a proper circumference. I am thinking vector calculus.

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Multiply the diameter times pi.

Not quite sure what you mean by "true way". You can measure it with a string or a similar flexible object. Or you can measure length and width, and - assuming it is an ellipse - use the formula for the circumference of an ellipse - or rather, an approximation formula.

Because the circumference of a circle isn't a straight line its hard to measure, even if you have a flexi-ruler, your never going to be able to line it up to get an exact measurement. Therefore its much easier to measure the diameter and use the formula

No, in order to fine the arc length you need a formula which is: Circumference x arc measure/360 degrees

circumference=r2pi

It is not clear whether you want the formula of some aspect (area or circumference) of a circle when given its radius or a formula for its radius when given some characteristic measure of the circle.

Because:- circumference/diameter = pi and when the formula is rearranged circumference = pi*diameter

The formula for the circumference of a circle is the same, whatever its diameter. Circumference = pi*diameter.

Circumference = 2*pi*r r(radius) * 2 = diameter So. assuming the bottle is fairly a circle, measure across the bottom to get the diameter and then divide that in half for the radius and use the circumference formula. Of course a bottle is not quite a perfect circle everywhere and you might need calculus to get a proper circumference. I am thinking vector calculus.

The circumference of the top of a plastic cup is the distance around its circular opening. This can be calculated using the formula: Circumference = ฯ x diameter. Simply measure the diameter of the top of the cup and multiply it by ฯ (approximately 3.14) to find the circumference.

use the formula pi*diameter = circumference and the formula diameter = 2*radius and combine them 2pi*radius = circumference now you have a formula that you can just plug you numbers into. if you have 3 as your radius, then this is how to find the circumference 2pi*3=circumference 6.28*3=circumference 18.84=circumference

There is no circumference of a cone, but, we only do the circumference of the circle. the formula for the circle is pi times D. D= Diameter