Question

Find the surface area of the Cylinder in terms of PI.

Answer 1

How about you try \[2 \pi r^2 + 2\pi r h\] first.

Answer 2

\[D= 2r\]So \[r= D/2\]

Answer 3

I dont have a calculator i left it at my dads house :/

Answer 4

I needs someone to solve and walk me through it.

Answer 5

Since it says leave in terms of π, you don't need a calculator :)

Answer 6

Ok well at least can you set up the answer using the formula first? It's plugging in values.

Answer 7

so then what do i multiply?

Answer 8

\[2πr^2+2πrh\]
h= height
r= radius

Answer 9

still dont get it.. . . :(

Answer 10

Ok you are given the diameter as 14cm, so your radius will be half of that. 14/2= 7cm.
You are also given a height of 18cm, so you just have to plug in these two values into the formula for surface area, which I gave you.
So it will be
\[2 \pi \times (7)^2 cm^2 + 2 \pi \times 7 \times 18 cm^2\]

Answer 11

i need a calculator to solve it and i dont have one...

Answer 12

Your answer will be in terms of \[\pi\] so you don't really need a calculator.
\[2 \pi \times (7)^2 = 2 \pi \times 49 = 98 \pi \]
I'm sure you can do the other part. Then just add them together.

Answer 13

is it 644picm^2?

Answer 14

Try again.

Answer 15

350picm^2?

Answer 16

Yes that's correct.

Answer 17

thanks so much.

Answer 18

No problem.