# V7028\. A user\-defined mathematical constant is used instead of a built\-in constant\. The resulting value may be inaccurate\.

The analyzer has detected that the constants used for mathematical calculations lack sufficient precision\.

The example:

```cpp
function calculateCircumference(radius) {
  const diameter = 2 * radius;
  return diameter * 3.1415;
}
```

This record is not entirely correct, as it may lead to imprecise calculation results\. When working with mathematical constants, it is recommended to use the properties and methods of the `Math` object\. 

The fixed example:

```cpp
function calculateCircumference(radius) {
  const diameter = 2 * radius;
  return diameter * Math.PI;
}
```