Answer
$$s \approx 0.3898$$
Work Step by Step
$$\eqalign{
& \cos s = 0.9250 \cr
& {\text{Solving for }}s \cr
& s = {\cos ^{ - 1}}\left( {0.9250} \right) \cr
& {\text{Using a calculator into radian mode }} \cr
& s \approx 0.3898 \cr} $$
