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The circumference of a 4-inch diameter circle is: about 12.57 inches. (diameter x pi = circumference). If you need to solve some geometry exercises, this circumference calculator is the page for you. It is a tool specifically created to find the diameter, circumference and area of any circle. Read on to learn:
As is the case with all of our tools, the circumference calculator works in all directions - it is also a circumference to diameter calculator, and can be used to convert circumference to radius, circumference to area, radius to circumference, radius to diameter (duh!), radius to area, diameter to circumference, diameter to radius (yes, again with the rocket science), diameter to area, area to circumference, area to diameter or area to radius. If you want to draw a circle on the Cartesian plane, you might find this equation of a circle calculator useful.
The circumference of a circle is the linear distance of a circle's edge. It is the same as the perimeter of a geometric figure, but the term 'perimeter' is used exclusively for polygons. Circumference is often misspelled as circumfrence.
The following equation describes the relation between the circumference and the radius R of a circle: C = 2πR Where π is a constant approximately equal to 3.14159265...
A similarly simple formula determines the relationship between the area of a circle and its radius: A = π * R²
If you wish to calculate the properties of a three-dimensional solid, such as a sphere, cylinder or cone, it's best to use our volume calculator.
You have probably noticed that, since diameter is twice the radius, the proportion between the circumference and the diameter is equal to π: C/D = 2πR / 2R = π This proportion (circumference to diameter) is the definition of the constant pi. It is used in many areas, such as physics and mathematics. For example, you can find it in the centrifugal force calculator.
To calculate the circumference, you need the radius of the circle:
Or you can use the circle's diameter:
The circumference of a circle is the linear distance of the circle's edge. It is equivalent to the perimeter of a geometric shape, although that term perimeter is only used for polygons.
The first person to calculate the Earth's circumference was Eratosthenes, a Greek mathematician, in 240 B.C. He discovered that objects in a city on the Northern Tropic do not throw a shadow at noon on the summer solstice, but they do in a more northerly location. Knowing this, and the distance between the locations, he succeeded in calculating the Earth's circumference.
If you want to find the diameter from the circumference of a circle, follow these steps:
To find the area of a circle from the circumference, follow these steps:
To find the radius from the circumference of a circle, you have to do the following:
The formula for the circumference, if the circle's radius is given, is: Or if the circle's circumference is given: You can estimate π as 3.14.
To calculate the circumference of a circle with a radius of 1 meter, simply follow these steps:
To find the circumference of a cylinder, you have to be aware that a cylinder's cross-section is a circle. If you know the cylinder's radius:
Or you can use the cylinder's diameter:
If you want to find the area of a circle with a circumference of 1 meter, do the following:
To find the radius of a circle with a circumference of 10 centimeters, you have to do the following:
Since a circle's circumference is the linear distance of the circle's edge, it describes a length. Therefore, the most common units of a circle's circumference are millimeter, centimeter, meter for the metric system, and inch, feet, and yard for the imperial system. |