Using the Cosine of angles
[tex]cos\theta=\frac{Adjacent}{Hypotenuse}[/tex]
Given
[tex]\begin{gathered} \theta=a \\ Adjacent=45 \\ Hypotenuse=60 \end{gathered}[/tex]
Therefore,
[tex]\begin{gathered} cosa=\frac{45}{60} \\ a=\cos^{-1}(\frac{45}{60})=41.40962210927\approx41.41 \end{gathered}[/tex]
Hence, a = 41.41 (Option 4).
