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# Calculate Diameter

## Calculate the diameter of a circle

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Specify below which unit is known:

(E.g. I know the circumference, and it has a value of 10cm)

## Calculating the diameter of a circle

Calculating the diameter of a circle is a fundamental aspect of geometry and has many practical applications. Before we can make these calculations, we first need to understand some basic concepts.

The diameter of a circle is the length of a straight line that runs from one side of the circle to the other, passing through the center of the circle. It is twice the radius, which is defined as the distance from the center of the circle to the edge.

There are several ways to calculate the diameter of a circle, depending on the information available.

### If the radius is known

If the radius of the circle is known, calculating the diameter is simple:

`diameter = 2 * radius`

### If the circumference is known

If the circumference of the circle (the distance around the circle) is known, the diameter can be calculated using the formula:

`diameter = circumference / π (pi)`

Here, π is a mathematical constant with an approximate value of 3.14159.

### If the area is known

If the area of the circle is known, the calculation is a bit more complex. The diameter can be calculated using the formula:

`diameter = √(4 * area / π)`

It is important to remember that for all these formulas, the units must be consistent. For example, if the radius is given in centimeters, the diameter will also be in centimeters.

In everyday life, the diameter of a circle is often used when calculating distances, areas, and volumes, whether it's the design of wheels, the size of a slice of pizza, or the capacity of a cylindrical tank. Understanding how to calculate the diameter of a circle is not only a fundamental part of math but also a useful skill in many practical situations.