■サマーヴィルの等面四面体(その632)
【1】△4 in △3
a^2=3m^2+h^2(4)
b^2=4m^2+4h^2(3)
c^2=3m^2+9h^2(2)
d^2=16h^2(1)
【2】F5 in △3
【3】G6 in △3
【4】H7 in △3
でも
3m^2+h^2(4)<3m^2+9h^2(2)
4m^2+4h^2(3),16h^2(1)
は変わらない.
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