Okay, the user wants me to translate "quarter-circle" into Arabic. Let me start by understanding the term. A quarter-circle is one-fourth of a circle, so in Arabic, that would be "ربع دائرة". But wait, I should make sure that's the correct term. Sometimes, technical terms might have specific translations. Let me double-check.
I know that "quarter" translates to "ربع" and "circle" is "دائرة". So combining them, "ربع دائرة" seems right. I don't think there's a more specific term for it in Arabic. Also, the user mentioned if the content is already in Arabic, leave it as is. Since the input is in English, I need to translate it. No explanations, just the translation. Alright, I'll go with "ربع دائرة".