あっちのスレをカンニングすると、
∠A=50, ∠B=70, ∠C=60;　a=2, b=3, c=4,
S' = S(a sin(A), b sin(B), c sin(C)) = 2.117029044766
⊿ABC = s(A, B; a, b, c) = 10.1292395794765
R = √{⊿ABC/[2sin(A)sin(B)sin(C)]} = 2.8502845352614
AB = 2R sin(C) = (√3)R = 4.93683763110
BC = 2R sin(A) = 4.3668892590900
CA = 2R sin(B) = 5.3567826898507