Cylinder A has radius r and height h. Cylinder B has radius 2r and height 2h. How many times greater is the surface area of Cylinder B than the surface area of Cylinder A?

Question

Cylinder A has radius r and height h.  Cylinder B has radius 2r and height 2h. How many times greater is the surface area of Cylinder B than the surface area of Cylinder A?
I have no idea how to start doing this problem. Are there any tips on how to start?

Ya ,om · Accepted Answer

Ya mom

bobpursley · Answer

surface are cylinded = 2*PI*(2r)+2PI*r*h

that is if the cylinder ends are counted.
Surface area of lateral surface only: PI*2r*h

so if it is a cylinder with ends open, now begs the question does the interior surface area matter? If so, double the above.

if exterior lateral side area only, then Area= PI*2(2r)*2H

looks like Area quadrupled.

Ya mom · Answer

4 times greater hope this helps

Scarlett · Answer

2*2=4 (educated guess)= 4