# Constants

TRIK Studio has only one built-in constant. It can be used in the same way as [sensor variables](https://help.trikset.com/en/studio/programming-visual/expression-syntax/sensory-variables), but its value cannot be changed.

|        |                  |                                                                                                      |
| ------ | ---------------- | ---------------------------------------------------------------------------------------------------- |
| **pi** | 3.14159265358979 | Represents the ratio of the circumference of a circle to its diameter, determined by the constant π. |