Answer
The angle in the degree is $B=24.1{}^\circ $.
Work Step by Step
Take the ${{\cos }^{-1}}$ to both sides of the equation,
${{\cos }^{-1}}\left( \cos B \right)={{\cos }^{-1}}\left( 0.9128 \right)$
The steps of the Ti-83 calculator are as follows
Step1: Open Ti-83.
Step2: Press $+$ button.
Step3: Enter value like this,
${{\cos }^{-1}}\left( 0.9128 \right)=24.1047$
The obtained value is $24.1047$.
