Question 287853
The answer is E.
 When doing these try to KEEP IT SIMPLE.
We are concerned with ratios--not actual measures.
Sooo WHY NOT let the original radius and height be ONE?????
pi (r^2)height = pi or, pi TIMES 1 TIMES 1=======just little ole' pi.
NOW we double--let r be two and so H is 2 also.
NOW we get pi(4)(2)=8(pi) so
pi/8pi is the relationship, you are left with 8pi!  (The pi's cancel out!)