Cho tam giác ABC có diện tích là 216 cm2 , BC = 36 cm . Trên cạnh AB lấy điểm M sao cho AM = 1/3 AB , trên cạnh AC lấy điểm N sao cho AN = 1/3 AC và trên cạnh BC lấy điểm I sao cho CI = 1/3 CB . Nối M với N , nối N với I ta được hình thang MNIBC a) Tính diện tích hình thang MNIB. b) Tính độ dài đoạn MN .

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