The Radius of the inner circle is 2 cm and the radius of the outer circle is 6 cm

english maybe i can ..

for this case we have that by definition, the volume of a cylinder is given by:

where:

r: it's the radio

h: it's the height

we have as data that:

substituting:

so, the cylinder volume is

option d

answer is  

c.

56

hope you get this right