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2 năm trước
Bài 1 tính diện tích hình tròn biết chu vi C = 6,28cm Bài 2 miệng giếng nước là một hình tròn có bán kính 0,7m. Người ta xây thành giếng rộng 0,3m bao quanh miệng giếng . tính diện tích của thành giếng đó Giúp mik nha mik đang cần gấp
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