A paper cone is to be made from a three-quarter circle having radius 4 inches (shaded). What is the length of the arc on the discarded quarter-circle (dotted portion)? Express your answer in terms of $\pi$.

[asy]
size(80);
import graph;
draw(Arc((0,0),1,0,90),linetype("2 4"));
filldraw((0,0)--(0,1)--Arc((0,0),1,90,360)--cycle,gray(.6),linewidth(1));
label("$4''$",(.5,0),S,fontsize(12pt));[/asy]
<|im_start|>system
You are a helpful assistant.<|im_end|>
<|im_start|>user
A paper cone is to be made from a three-quarter circle having radius 4 inches (shaded). What is the length of the arc on the discarded quarter-circle (dotted portion)? Express your answer in terms of $\pi$.

[asy]
size(80);
import graph;
draw(Arc((0,0),1,0,90),linetype("2 4"));
filldraw((0,0)--(0,1)--Arc((0,0),1,90,360)--cycle,gray(.6),linewidth(1));
label("$4''$",(.5,0),S,fontsize(12pt));[/asy]
Please reason step by step, and put your final answer within \boxed{{}}.<|im_end|>
<|im_start|>assistant

user
2\pi
A paper cone is to be made from a three-quarter circle having radius 4 inches (shaded). What is the length of the arc on the discarded quarter-circle (dotted portion)? Express your answer in terms of $\pi$.

[asy]
size(80);
import graph;
draw(Arc((0,0),1,0,90),linetype("2 4"));
filldraw((0,0)--(0,1)--Arc((0,0),1,90,360)--cycle,gray(.6),linewidth(1));
label("$4''$",(.5,0),S,fontsize(12pt));[/asy]
train