正弦定理より
b/sin45°＝a/sin60°
b/(√2/2)＝4/(√3/2)
b＝4×√2×(1/2)/√3×(1/2)
b＝4√6/3
正弦定理より
b/sin45°＝2R
(4√6/3)/(1/√2)＝2R
2R＝(4√6/3)×√2/(1/√2)×√2
＝8√3/3
R＝4√3/3
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