Answer:
The arc-length of the semicircle is approximately 34.54 units
Step-by-step explanation:
Recall that the arc length of the whole circumference is defined by the formula:
[tex]Circumference's \,\,length=2\,\pi\,R[/tex]
where R is the radius of the circle (in your case 11 units)
So the length of half a circumference (which is actually the arc length of the semicircle you are requested to find) would be half of the formula we just mentioned:
[tex]Arc\,\,length=\pi\,R\\Arc\,\,length= 3.14\,(11)\\Arc\,\,length= 34.54\, \,units[/tex]
