The volume V of a right circular cylinder of height h and radius r is V=pr^2h. If the height is twice the radius, express the volume V as a function of r

Question

please help.

Answer 1

Hi Tammie,

 

OK so we have the volume formula

 

V=(pi)r²h

 

and we know that h = 2r  

 

so we can replace h with 2r and we get

 

 

V = (pi)r²(2r)

 

V=2(pi)r³  

 

 

Hope this helps