1. anonymous

The volume for a cylinder is given by the formula V = r2h, where r is the radius of the cylinder and h is the height of the cylinder. If the volume of a cylinder with a height of 6 centimeters is 384 cubic centimeters, then what is the radius of the cylinder?

2. anonymous

A.64cm B.32cm C.48cm D.8cm

3. anonymous

@DanJS can you help me please??

4. Rushwr

are u sure that it V=2rh is the equation shouldn't it have a pi value sum where ?

5. anonymous

yeah hold on its

6. anonymous

$V=\pi r ^{2}h$

7. anonymous

and the other one is $384\pi$

8. Rushwr

if that's so $r ^{2} = \frac{ V }{ \pi h }$ $r = \sqrt{\frac{ V }{ \pi h }}$ Substitute and tell me the answer !!!!!

9. Rushwr

make sure that u substitute the value with units then u can see pi is getting cancelled off .

10. anonymous

i dont know how

11. Rushwr

Did u get the part how I subjected r ?

12. anonymous

because r is the radius and you have to find the radius of the cylinder thats why

13. Rushwr

u got that part right? now it's just the substitution and calculation

14. anonymous

yeah i got it

15. Rushwr

|dw:1443164607917:dw| right?

16. Rushwr

|dw:1443164718936:dw| Cut off the units now !

17. Rushwr

??

18. anonymous

is it 32cm?

19. Rushwr

|dw:1443164817921:dw|

20. Rushwr

$r = \sqrt{\frac{ 384cm ^{2} }{ 6 }} = \sqrt{64cm ^{2}} = 8cm$

21. anonymous

oh i thought it was 64

22. Rushwr

hahahahahah !!!!

23. anonymous

can you help me with another one i will medal you this one

24. Rushwr

Did u get it now ?

25. Rushwr

lol no problem. Open up a new question okai ?

26. anonymous

yeah but not fully

27. Rushwr

Which part do u find it hard >