8.3 习题8.3（P120页，第5题，正方体、正三棱柱与外接球）

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  1. 必修2 8.3 简单几何体的表面积与体积（P120页，习题5，正方体与外接球）正方体边长a与外接球半径R的关系 (.ggb)
     
  2. 正三棱柱与外接球的半径关系 (.ggb)