Okay, the user wants me to translate "quarter-circle" into Ukrainian. Let me think. The word "quarter" in Ukrainian is "чверть," and "circle" is "коло." So combining them, it should be "чверть кола." Wait, is there a more common term? Maybe "четвертина кола"? No, "чверть" is the correct term for a quarter. Let me confirm. Yes, "чверть кола" is the standard translation. I should make sure there's no hyphen needed. In Ukrainian, it's usually written without a hyphen. Alright, that's the translation.