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計算すると6.381となるため④

偏平率f、赤道半径a、極半径bとすると、
f=(a-b/a)
af=a-b
a(1-f)=b
a=b/(1-f)

1-f=1-1/298=297/298

a=6.36❌10^3❌(298/297)
≒6.381❌10^3
≒6.38❌10^3 🙇

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扁平率 = 1-極半径/赤道半径
赤道半径 = 極半径/(1-扁平率)
= 6.36×10³/(1-1/298)
= 6.3814×10³

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