Okay, the user wants me to translate "quarter-circle" into Hindi. Let me think. The term "quarter-circle" refers to a quarter of a circle, which is 90 degrees. In Hindi, "quarter" is "चौथाई" and "circle" is "वृत्त". So combining them, it should be "चौथाई वृत्त". I need to make sure there's no existing Hindi term that's more commonly used. Maybe "चौथाई वृत्त" is correct. Let me confirm. Yes, that seems right. I'll output that.