cho tam giác ABC cân tại A có BC=6cm và độ dài đường cao AM =4cm. vẽ (O) ngoại tiếp tam giác ABC. a, tính AB và đường kính AA' của đường tròn (O) b,gọi B là điểm đối xứng của B quaO . Vẽ AH ⊥CB' tại h.TỨ giác AHCM là hình gì? Giúp mình với ạ !! Hứa vote 5 sao ạ

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