Answer
$$s \approx 1.3265$$
Work Step by Step
$$\eqalign{
& \tan s = 4.0112 \cr
& {\text{Solving for }}s \cr
& s = {\tan ^{ - 1}}\left( {4.0112} \right) \cr
& {\text{Using a calculator into radian mode }} \cr
& s \approx 1.3265 \cr} $$
