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Gaokao Math Practice Question

10. (5 分) 设三棱柱的侧棱垂直于底面, 所有棱长都为 $a$, 顶点都在一个球面 上, 则该球的表面积为()

  1. A.$\pi a^{2}$
  2. B.$\frac{7}{3} \pi a^{2}$
  3. C.$\frac{11}{3} \pi a^{2}$
  4. D.$5 \pi a^{2}$

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