【物理】
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これだ良いのかなぁ
R = r * 1.07180 = α / r^4α = 180 x r^4BP2 = α / R^4 = 180 x r^4 / R^4= 180 x r^4 / (r x 1.07)^4= 180 x r^4 / (r^4 x 1.07^4) = 180 / 1.07^4= 180 / 1.31= 137