In a circle with a radius of 3 ft, an arc is intercepted by a central angle of 2π3 radians. what is the length of the arc? 2π ft 3π ft 6π ft 9π ft

The correct question is 
In a circle with a radius of 3 ft, an arc is intercepted by a central angle of 2π/3 radians. What is the length of the arc? 

we know that
in a circle
2π radians > lenght of (2*π*r)
2π/3 radians> X
X=[(2π/3)*(2π*r)]/[2π]=(2π/3)*r

 the lenght  of the arc=(2π/3)*3=2π ft

the answer is 2π ft