Gaokao Math Practice Question
正四棱台的上、下底面的边长分别为 2,4 , 侧棱长为 2 , 则其体积为 ($\quad$)
- A.$20+12 \sqrt{3}$
- B.$28 \sqrt{2}$
- C.$\frac{56}{3}$
- D.$\frac{28 \sqrt{2}}{3}$
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