Mashaal Masha
The circle below has center $O$, the length of arc $\overset{\large\frown}{ADC}$ is $5\pi$, and $x=100$. What is the length of the arc $\overset{\large\frown}{ABC}$

 

Difficulty: Hard
A: 

$9\pi$

B: 

$13\pi$

C: 

$18\pi$

D: 

$\dfrac{13}{2}\pi$

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