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nguyentrunghieu18101976
2 năm trước
cho hình nón có chiều cao h = 6 và bán kính đường tròn đáy r = 3. xét hình trụ đấy nằm trên hình tròn đáy của hình nón , đường tròn của mặt đáy còn lại nằm trên mặt xung quanh của hình nón sao cho thể tích khối trụ lớn nhất. khi đó , bán kính đáy hình trụ bằng a. 9/4 b. 2 c. 1 d. 3/2
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