S1=2m,∠α=40°
S1x=S1∗cosα=2∗cos40°=1.53m
S1y=S1∗sinα=2∗sin40°=1.29m
S2=4m,∠β=120°
S2x=S2∗cosβ=4∗cos120°=−2m
S2y=S2∗sinβ=4∗sin120°=3.46m
Sx=S1x+S2x=1.53−2=−0.47m
Sy=S1y+S2y=1.29+3.46=4.75m
S=Sx2+Sy2=−0.472+4.752=4.77m
cosγ=SSx=4.77−0.47=−0.09853
γ=arccos(−0.09853)≈95°
Answer: 4.77m;angle 95°
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