Check the picture below. Recall that a full circle has 360°.
[tex]\boxed{19}\\\\ \cfrac{359-27x}{2}=12x+1\implies 359-27x=24x+2\implies 359=51x+2 \\\\\\ 357=51x\implies \cfrac{359}{51}=x\implies 7=x \\\\\\ \boxed{20}\\\\ \stackrel{\widehat{QR}}{359-27x}\implies 359-27(7)\implies 170[/tex]
