# Circle Calculator

To calculate the diameter of a circle, you need to know the radius of the circle. The diameter of a circle is simply twice the radius.

Here’s the formula for calculating the diameter of a circle:

For example, if the radius of a circle is 5 cm, the diameter would be 2 * 5 cm = 10 cm.

You can also use the formula for the circumference of a circle to calculate the diameter. The circumference is the distance around the outside of the circle, and it can be calculated using the formula:

circumference = 2 * pi * radius

If you know the circumference of a circle, you can use this formula to calculate the diameter:

diameter = circumference/pi

For example, if the circumference of a circle is 20 cm, the diameter would be 20 cm / 3.14 = 6.28 cm.

## Circle Calculator

2. What is the formula for calculating the diameter of a circle? The formula for calculating the diameter of a circle is `diameter = 2 * radius`.
3. Can you use the circumference of a circle to calculate the diameter? Yes, you can use the formula for the circumference of a circle (`circumference = 2 * pi * radius`) to calculate the diameter by rearranging the formula to solve for the diameter: `diameter = circumference / pi`.