Question

I don't understands how to find the surface area of a cylinder. I know the steps and stuff but I always get different answers then my teacher. Can anybody help?

Answer 1

Post a surface area of a cylinder problem here and we will try to help you.

Answer 2

To find the surface area we need to understand the formula. *Warning: Cheat Sheet Incoming* 2B + Ch = SA. That basically means the area of the two bases or r^2 x pi x 2 + the circumference which is r x 2 x pi times the height.

Answer 3

If you need me to break it up a little more, please ask.

Answer 4

#21 please

Answer 5

Okay, so let's just plug in the values in the formula. What is the area of the base Nessa.123? Hint: It's the radius (r)^2 x pi.

Answer 6

#21 please @jupitersring01 @directrix

Answer 7

So it would be 3x2? Or is it 3squared?

Answer 8

I was afk. I'm back now :)

Answer 9

So it's 3x3=9x3.14= 28.26 ?

Answer 10

That's correct Nessa.123! Now multiply by 2 to get 56.52. What next?

Answer 11

?

Answer 12

Next we find the circumference, and if you remember that's r x 2 x pi. So what's C, the circumference?

Answer 13

Oh you find the ch which is 2 x pi x r x h

Answer 14

*Hands smart cookie* Correct! Then we just add 2 x A.

Answer 15

So, 56.52 + 188.49, I'm assuming?

Answer 16

So it's r x h which is 10 x 3 and then that's 30 and then 30 x 3.14 which is 94.20 and then 94.20 x 2 which is 188.40? Or am I doing something wrong?

Answer 17

This is my work for the ch

Answer 18

After you find the ch isn't it 56.52 x 2 and then add 188.4? Then again I could be wrong. This is an example they give me in my book

Answer 19

Hello?

Answer 20

Why would I start over? :| I've gotten so far

Answer 21

The answer to this is 301.44 cm^2 or is it 244.92 cm^2?