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Gaokao Math Practice Question

7. (5 分) 设长方体的长、宽、高分别为 $2 a 、 a 、 a$, 其顶点都在一个球面上, 则该球的表面积为 $(\quad)$

  1. A.$3 \pi a^{2}$
  2. B.$6 \pi a^{2}$
  3. C.$12 \pi a^{2}$
  4. D.$24 \pi a^{2}$

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