## anonymous 5 years ago surface area of cylinders height 10 and radius of 10 how do i work this out

1. anonymous

2 π r2 + 2 π r h

2. anonymous

$surface area of cylinder is =2pir ^{2}+2pirh$ so = 2*pi*100+2*pi*100

3. anonymous

It is a closed cylinder or open cylinder????

4. anonymous

yes

5. anonymous

what does yes mean ??? open cylinder like a pipe or closed cylinder like a pepsi can??

6. anonymous

closed cylinder see i know to use 2 π r2 + 2 π r h and when i do i get but it give me answer and that is not one of them

7. anonymous

8. anonymous

340 ,150,130,176,384,360,112,720

9. anonymous

Any unit for radius and height like m, cm etc.???

10. anonymous

well see i got it now they were doing it like $\pi*5^2=25\pi then 2\pi5=10\pi 10\pi*10=100\pi +\pi*5^2=25\pi at the end you add 25\pi+25\pi+100\pi$ and gett 150pi

11. anonymous

From where has the 5 come??? Y said radius was 10 and height was 10