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anhemximen58
2 năm trước
Tam giác ABC đều có độ dài cạnh bằng a. Kẻ AH vuông góc với BC tại H thì độ dài đoạn thằng AH là: A. a mũ 2 B.a√2 C. a√3/2 D. a/2 Chọn và giải thích giúp mk nhé!!!
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