20/11/15 05:36:18.89 WOfFn0Se.net
Excel解
s(50,70; 2,3,4) = 10.1292395794765
S' = S(2sin(50), 3sin(70), 2√3) = 2.1170290447659
s(45,90; 3,4,5) * 2 = 31.966629547096
S' = S(3/√2, 4, 5/√2) = 3.74165738677394
20/11/15 05:36:18.89 WOfFn0Se.net
Excel解
s(50,70; 2,3,4) = 10.1292395794765
S' = S(2sin(50), 3sin(70), 2√3) = 2.1170290447659
s(45,90; 3,4,5) * 2 = 31.966629547096
S' = S(3/√2, 4, 5/√2) = 3.74165738677394