Cho tam giác ABC cân tại A gọi M,O lần lượt là trung điển BC và AB gọi N là điểm đôi xứng M qua 0 a) tính diện tích tam giác ABC,biết AC=5cm BC=6cm b) tứ giác AMBN là hình gì? Vì sao? c) tâm giác ABC có thêm điều kiện gì thì tứ giác AMBN là hình vuông?

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