Trực tuyến tính mà sẽ giúp bạn tìm được chu vi của một vòng tròn, chu vi của một vòng tròn là bằng (chu kì 2) nhân (r) bán kính. Một vòng tròn là một dạng nơi điểm của máy bay có khoảng cách tới một điểm không hơn những quy định, và một vòng tròn là một đóng cửa phẳng (đường cong) trong đó tất cả các điểm được loại bỏ tại cùng một khoảng cách từ khu trung tâm.
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