This is a feminine noun, so you would use "la" before it.
For example, you would say:
* "J'ai besoin d'une règle." (I need a ruler.)
* "Où est la règle ?" (Where is the ruler?)
This is a feminine noun, so you would use "la" before it.
For example, you would say:
* "J'ai besoin d'une règle." (I need a ruler.)
* "Où est la règle ?" (Where is the ruler?)