Answer:
The minute hand of the watch would sweep through an angle of;
[tex]228^{\circ}[/tex]Explanation:
Given that the class started at 12:12 PM and ended at 12:50 PM.
The number of minutes used is;
[tex]50-12=38\text{ minutes}[/tex]The minute hand makes a complete rotation in 60 minutes.
[tex]\begin{gathered} 60\text{ minutes }\rightarrow360^{\circ} \\ 1\text{ minutes }\rightarrow\frac{360^{\circ}}{60} \\ 38\text{ minutes }\rightarrow\frac{360^{\circ}}{60}\times38 \\ 38\text{ minutes }\rightarrow228^{\circ} \end{gathered}[/tex]Therefore, the minute hand of the watch would sweep through an angle of;
[tex]228^{\circ}[/tex]