As AB is a diameter, then m∠CBA=180^{0}-75^{0}=105^{0}.
∠CBA is a central angle, so its measure multiplied by radius is the length of arc AC.
Note that
and 
. Then 
and length of the arc is 
.The correct answer is 22 in.
∠CBA is a central angle, so its measure multiplied by radius is the length of arc AC.
Note that