Okay, the user wants me to translate "quarter-circle" into Filipino. Let me think about the correct term.
First, "quarter" in Filipino is "kapat" or "isang kapat." But in geometric terms, "quarter-circle" is commonly known as "isang kapat na bilog" or "kapat na bilog." However, I should check if there's a more standard term.
Wait, sometimes technical terms are directly translated. "Quarter-circle" is a shape that's a fourth of a circle. In Filipino, "kapat" is used for a quarter, so "kapat na bilog" makes sense. But I've also heard "isang kapat na bilog" which is more literal.
Alternatively, maybe "isang kapat na bilog" is more precise. Let me confirm. If I search for "quarter-circle in Filipino," some sources use "kapat na bilog" or "isang kapat na bilog." Both are correct, but "kapat na bilog" is more concise.
Since the user wants the translation, and the original is in English, I should provide "kapat na bilog" as the direct translation. But I need to ensure that it's the standard term. If there's no exact equivalent, using "kapat na bilog" is acceptable.
I think that's the best translation here. So the answer should be "kapat na bilog."