Yes, typically, the pi (π) symbol is used on calculators for calculations involving circles or trigonometric functions where the exact value of pi is needed for more precise results. When a problem specifically asks you to use 3.14, you should substitute pi with that value.
In summary:
- Use π in calculations for greater precision unless otherwise specified.
- Use 3.14 if explicitly asked to do so.
Both methods are correct; it just depends on the context of the problem you're solving.