# Một cay tre cao 9m bị gió làm gãy ngang thân, đoạn bị gãy có ngọn cây chạm đất và tạo với mặt đất

###### Question:

Một cay tre cao 9m bị gió làm gãy ngang thân, đoạn bị gãy có ngọn cây chạm đất và tạo với mặt đất một góc 30°. Bạn An dự định chặt phần thân cây từ điểm gãy đến gốc để làm cột nhà cao 3,2m. Em hãy giúp bạn An xem phần thân cây còn lại có đủ dài để làm cột nhà hay không

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