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Chóp tam giác đều
+ Đây là tam giác đều
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Giống nhau
Tập hợp các điểm M cách đều điểm O cho trước một khoảng cách không đổi OM = R
Khác nhau
Đường tròn: Các điểm M nằm trong mặt phẳng.
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