Please help! Your help will be greatly appreciated cuz i have a test 2morro!!!! Will award with medal!!!

We-R-Plastic makes plastic cylindrical garbage cans for kitchens and bathrooms. How much plastic is used for a can that has a diameter of 7 inches and is 14 inches tall, not including its lid? Round to the nearest tenth.

Question

Please help! Your help will be greatly appreciated cuz i have a test 2morro!!!! Will award with medal!!!



We-R-Plastic makes plastic cylindrical garbage cans for kitchens and bathrooms. How much plastic is used for a can that has a diameter of 7 inches and is 14 inches tall, not including its lid? Round to the nearest tenth.

anonymous · Answer

Are you given a thickness or is it solid plastic?...

jim_thompson5910 · Answer

why would you make a trash can that is completely solid and have no inner space to hold trash?

lilai3 · Answer

i'm not really sure..that's why  i need help...uhm...they didn't give a thickness. I typed every word and puncutation symbol from the problem my teacher gave me :P

jim_thompson5910 · Answer

It sounds like all you need to do is find the volume of a cylinder with a diameter of 7 inches and height 14 inches

lilai3 · Answer

@jim_thompson5910  i thought the same thing you did, but i thought this problem would be talking about surface arera, and not volume...unless i'm wrong..

jim_thompson5910 · Answer

oh you're right, mixed up the two lol, my bad

yeah you want to find out how much material you'll need to cover the outside so to speak

lilai3 · Answer

so...it would be surface area right?

jim_thompson5910 · Answer

so you would use

SA = pi*r^2 + 2*pi*r*h

keep in mind we're not adding the lid

jim_thompson5910 · Answer

yes

comm.dan · Answer

Yes surface area and there is a formula involved for surface area

lilai3 · Answer

and the formula would be...?

jim_thompson5910 · Answer

SA = pi*r^2 + 2*pi*r*h

lilai3 · Answer

oh. thanks jim

comm.dan · Answer

A=BXH

lilai3 · Answer

@Comm.Dan isn't it supposed to be a circle, so it's like sumthing to do with pi?

comm.dan · Answer

Yes it is @lilai3

comm.dan · Answer

I know it involves pi squared and 2 pi r

anonymous · Answer

Lateral area plus bottom lid:$$7 \pi  14+\pi  \left(\frac{7}{2}\right)^2=346.4\text{  }\text{inch}^2 $$

comm.dan · Answer

Where in the world did you get that from @robtobey

anonymous · Answer

circumference of the cylinder times the cylinder height plus the area of the lower circle, "lower lid".

comm.dan · Answer

Alright Thx @robtobey

anonymous · Answer

You're welcome

lilai3 · Answer

oh. thanks, all you guys, i wish i could give all of you a medal, and i'm sad that i can only choose one. thanks!

anonymous · Answer

@lilai3
Thank you for the medal.

lilai3 · Answer

ur welcome. do you mind also helping me on my next question?