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  kietjumper  đã bình luận lúc 18, Tháng 10, 2024, 2:36

  Công thức tính diện tích hình tròn: ~a~ * ~a~ * ~pi~ (~a~ là bán kính hình tròn, ~pi~ = 3.14)

  Hàm làm tròn:

  cout << fixed << setprecision(2) << value; //value là diện tích hình tròn ở trên
  

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  pt48583994  đã bình luận lúc 27, Tháng 6, 2025, 3:53

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