Get our expert's

answer on brainly

SEE EXPERT ANSWER

Get your **free** account and access **expert** answers to this and **thousands** of other questions.

I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!

Get this expert

answer on brainly

SEE EXPERT ANSWER

Get your **free** account and access **expert** answers to this and **thousands** of other questions

https://suwannee.owschools.com/media/g_geo_2013/8/group100.gif

It's okay

the formula for area of the base of a cylinder is A = pi(r^2)

Okay. But every time I put it into the calculator it shows: either 39.4384 or 50.24

I know.. we don't calculate the pi part.. leave it as is. so if r = 4 what is r^2?

Well then it's just 16

So it's B?

A=pi(4^2)
A=pi(16) =16 pi
yeah

Thanks. So would it be about the same thing for this problem?

I think we need the diameter of the cylinder formula.

yeah we need a different formula for that.

\[\large V = \pi r^2h\]

Yes

ok let V = 245, and h = 5

V r h = ï¿½ or 2
=

Well that didn't come out right

:(

\[\large 245 = \pi r^2(5)\]

What's "large"?

that's to make the font large

Oh

so we are solving for r that would mean that r needs to be by itself

our first goal is to have r^2 by itself .. and then afterwards we can take the square root

\[V = \pi r2h\]

r is squared

yeah it should have that ^ that carrot sign

\[\large V = \pi r^2h \]

anyway back to this \[\large 245 = \pi r^2(5) \] we need r^2 by itself so what do we need to do?

should we add both sides? subtract both sides? multiply both sides? or.. divide both sides by 5pi

divide both sides by 5 pi

yes. \[\large \frac{245}{5 \pi} = r^2\]

now we take the square root of both sides

So 49 = ?

Umm

we're not done.. we need to take the square root on both sides

UH OH! I need to refresh my screen is crazy

kk

Go ahead

I neded to digest a little

we need to take the square root of r^2 so we can have r

then once we have our r we can get the diameter. which is d =2r

r=2.5

that's not a choice for answers that would've yielded d = 5.. that's not right

No wait. 5 was the height not the diameter

mY BAD SRY

wait a minute we are solving for r.

I was thinking that the diameter is 7

cus 7 squared is 49

\[\large \sqrt{ \frac{245}{5 \pi} }= \sqrt{r^2} \]
becomes
???
what is the square root of r^2

49 times 3.14 = 153.86

Umm

once we find r
we can find the diameter which is d = 2r

What? ok no substituting we are solving for r we need the square root of r^2 .

I want an r by itself

now the diameter is d=2r
so d = 2( That whole square root)

\[\large \sqrt{r^2} \rightarrow r^{\frac{2}{2}} \rightarrow r^1 \rightarrow r \]

so now our \[d=2(\sqrt{\frac{245}{5 \pi}})\]

so we just need 245 divided by 5 pi... take the square root of that result and multiply by 2

7.9

yes. so our diameter is 7.9 kind of a dangerous number because we can round up to 8

7 units would be the closest to the answer.. though the real answer is 7.9

Okay. Look I'm sorry if I aggravated you. It's been a long couple of weeks and I'm really tired

Thanks for the help. I really appreciate it

Yeah I can connect with that

I have to go sleep. night

Really. Wow it's 9:55 AM here

well alright

I live in Florida btw