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2 năm trước
Cho đường tròn (O ; 2 cm ) .Lấy điểm A sao cho OA = 4 cm . Từ A kẻ 2 tiếp tuyến AB , AC của đường tròn ( O ) ( B , C là tiếp điểm ) . Chu vi tam giác ABC bằng : A.6 căn 3. B.4 căn 3. C.2 căn 3. D.5 căn 3. Giải thích ra giúp mình nhá. Giúp mình vs ạ. Mình gấp lắm. Mình vote 5*
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