The steps to calculate the diameter of a circle:

1. Measure the radius: The radius is the distance from the center of the circle to any point on its circumference. Use a ruler or measuring tape to measure the radius in inches, centimeters, or any other unit of measurement.
2. Multiply the radius by 2: To find the diameter, you need to double the radius. Use a calculator or perform the calculation manually by multiplying the radius by 2.
3. Round the answer: Depending on the level of precision required, you may need to round the answer to a certain number of decimal places or significant figures.

For example, let’s say the radius of the circle is 5 inches. To find the diameter, we would perform the following steps:

1. Radius = 5 inches
2. Diameter = 2 × Radius = 2 × 5 inches = 10 inches
3. The diameter is 10 inches.