Okay, the user wants me to translate "quarter-circle" into Turkish. Let me think. The word "quarter" in Turkish is "çeyrek" and "circle" is "daire". So combining them, it should be "çeyrek daire". I need to make sure there's no different term used in Turkish for this specific geometric shape. Maybe check if "çeyrek daire" is the standard term. I don't recall any other terms, so I'll go with that. Also, the user mentioned if the content is already in Turkish, leave it as is. Since "quarter-circle" is in English, translating it is necessary. Alright, the translation should be "çeyrek daire".