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www.reference.com/math/measure-circumference-circle-596a...

To measure the circumference of a circle, first measure the diameter and multiply that number by the mathematical constant pi. The diameter is a straight line that goes from one side of the circle to the other and passes through the center, and the value of pi is always 3.141592.

www.wikihow.com/Calculate-the-Circumference-of-a-Circle

To calculate the circumference of a circle, use the formula C = πd, where "C" is the circumference, "d" is the diameter, and π is 3.14. If you have the radius instead of the diameter, multiply it by 2 to get the diameter. You can also use the formula for circumference of a circle using radius, which is C = 2πr.

www.reference.com/math/calculate-circumference-circle-cd38...

How Do You Calculate the Circumference of a Circle? To calculate the circumference of a circle, multiply the diameter of the circle in question by pi. You need to know the diameter of the circle to complete this task. Measure the radius. Measure the distance from the center of the circle to the circumference. This is the radius of the circle.

www.wikihow.com/Calculate-the-Diameter-of-a-Circle

Calculating a circle's diameter is easy if you know any of the other dimensions of the circle: the radius, the circumference, or the area. It's also possible if you don't know any of the above dimensions but you do have a drawing of the circle. If you want to know how to calculate the diameter of a circle, just follow these steps.

sciencing.com/calculate-area-circumference-circle-7274267.html

You can solve these problems as long as you know the circle's radius and can do some simple multiplication. If you learn the value of the constant π and the basic equations for a circle's properties, you can quickly find the area or circumference of any circle.

sciencing.com/calculate-circumference-inches-8153429.html

You can calculate the circle's circumference in inches with pi in the equations circumference = 2 * radius * pi and circumference = diameter * pi. Locate the circle's center, and measure the length from its center to a point on its edge to find the radius .

www.hunker.com/12231404/how-to-measure-a-circle

Learn the formula for the circumference of a circle so you do not have to measure all the way around a circle. Measuring the distance around the outside of a circle can be difficult, especially if you don't have a flexible measuring tape. It is often easier to measure the diameter and multiply by 3.14.