[tex]▪▪▪▪▪▪▪▪▪▪▪▪▪ {\huge\mathfrak{Answer}}▪▪▪▪▪▪▪▪▪▪▪▪▪▪[/tex]
In the given figure, if the lines p and q are parallel then the angles 4 and 1 form the pair of co - interior Angles that sum upto 180°,
so,
- [tex] \angle4 + \angle1 = 180[/tex]
- [tex]\angle1 + 125 = 180[/tex]
- [tex]\angle1 = 180 - 125[/tex]
- [tex]\angle1 = 55 \degree[/tex]
