................................................
![class=](https://ro-static.z-dn.net/files/d29/22a29c92ece5e9657963ef75040c4c33.jpg)
Răspuns:
68°
Explicație pas cu pas:
m(∡BSC)=m(∡BOC)/2=90°/2=45°
m(∡USC)=m(∡USB)+m(∡BSC)=23°+45°=68°