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nguyendanganh99

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Cho $\triangle$ ABC. Gọi H, G, O lần lượt là trực tâm, trọng tâm, tâm đường tròn ngoại tiếp.
a/ Trên tia đối của OC, lấy N sao cho ON=OC. C/m NB // AH.
b/ Gọi I là trung điểm AG, K là trung điểm của HG, M là trung điểm của BC. C/m IK // OM, AH=2 OM.
c/ C/m HG=OG

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nguyendanganh99

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