Arc EF + arc FG = 180 ( Reason: GE is a straight line)
[tex]\begin{gathered} x-3+12x-25=180 \\ 13x-28=180 \\ 13x=180\text{ + 28} \\ 13x=208 \\ \text{Divide both sides by 13},\text{ we get,} \\ x\text{ =}\frac{208}{13}=16 \end{gathered}[/tex]
Arc DE = Arc GF = 12x - 25 = 12(16) - 25 = 192 - 25 = 167 degrees
Arc EF = x -3 = 16 - 3 = 13 degrees
Arc DFG = arc DE + arc EF + arc FG = 167 + 13 + 167 = 347 degrees
