Will medal and fan. Help with volume of cylinders, homework.
http://i.imgur.com/NfXz3wu.png
I get 402.12 but that's not an answer choice, help if you can.

Question

Will medal and fan. Help with volume of cylinders, homework.
http://i.imgur.com/NfXz3wu.png
I get 402.12 but that's not an answer choice, help if you can.

anonymous · Answer

No responses after almost half an hour, thanks openstudy.

anonymous · Answer

sorry was a little busy at the moment.... you still need help?

anonymous · Answer

@Rev.

anonymous · Answer

Yeah, I do. Thank you.

anonymous · Answer

but the way you solve the problem is to plug the values into the formula... so do you know the volume formula for a cylinder? and no problem, that's why I'm here

anonymous · Answer

Yeah, it's v=bh correct?

anonymous · Answer

And to get base you need to multiply the radius by pi, I think.

anonymous · Answer

close... in a simple whole formula it's:

$$\pi*r^2*h$$

anonymous · Answer

Oh, ok.

anonymous · Answer

so we plug in our values, r=4 h=8, plug them i and let me know what you get

anonymous · Answer

ok

anonymous · Answer

401.92?

anonymous · Answer

close... lets go through the steps... 

$$\pi*4^2*8$$

$$\pi*16*8$$

so if we need pi in the final answer we just need to multiply the two whole numbers without multiplying pi..
so what is the final answer?

anonymous · Answer

Oh. 128!

anonymous · Answer

yea, so your answer is $$128\pi$$

anonymous · Answer

Nice, thank you, I understand now!

anonymous · Answer

no problem, have a good day.

anonymous · Answer

You too!

anonymous · Answer

fan me, let me know if you need help

anonymous · Answer

Alright I will!