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Platonic solid 

 
他山之石:
 
 
Questions to be discussed
 
  1. Proving There Are Only Five
  1. net (making of platonic solids with cutting paper)
  1. Vertices
  1. edge
  1. face
  1. Euclid formula
  1. angle between two adjacent faces: https://blog.csdn.net/wh_17426/article/details/114228708
  1. area
  1. volume
  1. height
  1. probability
  1. group theory
 
 
 
 
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