Find the volume of a cylinder of height 6" and base with circumference 16". 96 cubic units 192 cubic units 384 cubic units

The correct question is
Find the volume of a cylinder of height 6" and base with circumference 16" pi.

96 pi cubic units 
192 cubic units
384 pi cubic units


we know that
[volume of a cylinder]=pi*r²*h

circumference=2*pi*r> r=circumference/(2*pi)
circumference=16*pi in
so
r=16*pi/(2*pi)> 8 in

[volume of a cylinder]=pi*r²*h
r=8 in
h=6 in
volume=pi*8²*6> volume=384*pi in³

the answer is
384*pi in³