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Circumference of a circle: 2*pi*radius or diameter*pi

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Q: If r is the radius of a circle and d is its diameter is an equivalent formula for the circumference C 2r?
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Related questions

What is the formula for the circumference of a circle if the diameter is 8.70 m?

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


If you have the circumference of a circle what is the diameter?

Formula: diameter = pi / circumference


What is the formula for the diameter or a circle?

If you are given the radius of the circle, you can use the formula: diameter = 2*radius If you are given the circumference of the circle, you can use the formula: diameter = circumference/pi


How to calculate the diameter of a circle when the circumference of the circle is 7?

pi*diameter = circumference Rearrange the formula so as the diameter is the subject of the formula: diameter = circumference/pi diameter = 7/pi = 2.228169203


What is the circumference of a circle with a diameter of 18 in.?

The formula to find the circumference of a circle is C = πd, where d is the diameter. Using this formula, the circumference of a circle with a diameter of 18 in is C = π × 18 = 56.52 in.


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

It is NOT a formula but an EQUATION . The answer is C = pi*d This equation has been known for thousands of years. It can also be in the form of C = 2 pi r NB 2r = d Also A = pi r^(2) for the area of a circle.


What formula do you use if you know the diameter of a circle and want to find the circumference?

circumference of a circle = pi * diameter.


Why the formula of circumference of circle always constant?

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


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

Circumference = (diameter) multiplied by (pi)


Formula of circumference?

Formula of Circumference of a circle: 3.14*Diameter of the circle. You could also do: 3.14*3.14*radius.


What is the circle circumference formula?

In order to calculate the circumference of a circle one must use a specific formula. The mathematical formula is C = D x 3.14. This translates to the circumference being equal to the diameter multiplied by 3.14, which is the equivalent to pi.


If r is the radius of a circle and d is its diameter what is an equivalent formula for the circumference C 2r?

c=πd