Okay, the user wants me to translate "quarter-circle" into Dutch. Let me think. The word "quarter" in Dutch is "kwart", and "circle" is "cirkel". So "quarter-circle" would be "kwartcirkel". I should check if there's a standard term for this. Maybe in geometry, they use "kwartcirkel" as well. I don't think there's a different term. Also, the user mentioned if the content is already in Dutch, leave it as is. Since "quarter-circle" is in English, I need to translate it. So the answer should be "kwartcirkel". Let me confirm with a quick search. Yes, "kwartcirkel" is the correct translation. Alright, that's the result.