Help.. I need details to help me understand.

- anonymous

Help.. I need details to help me understand.

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- anonymous

substitute 37.7 meters instead of C. What do you get?

- anonymous

\[\frac{ c }{ 2\pi } = r\] where C is your circumference

- anonymous

I'm confused

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## More answers

- Vocaloid

start with C = 2πr
replace "C" with 37.7

- Vocaloid

37.7 = 2πr
now solve for r

- anonymous

i dont know how to do this

- Vocaloid

divide both sides by 2π

- anonymous

... how do you divide that the π confuses me

- Vocaloid

π is just a number, it's equal to about 3.14

- Vocaloid

you know how to divide 37.7 by 2, right? you also know how to divide 37.7 by 3.14, right? just do both at the same time

- anonymous

18.85? & I'm unsure how to divide the second one ?

- Vocaloid

18.85/3.14 = ?
(use a calculator)

- anonymous

\[\frac{ 37.7 }{ 6.2831 }\]

- anonymous

it gives me a big number

- anonymous

I'm clearly horrible at math

- anonymous

\[\frac{ 37.7 }{ 2*3.14.159 }\]

- anonymous

err seems I added 1 to many . there... but that will give you your r value

- Vocaloid

enter "37.7", then press the divide button, then enter "6.2831", then press the enterbutton/equal sign

- anonymous

it should be #.xxxxxxxxx but you can ignore the xxxxxxx part as they are mostly 0

- Vocaloid

or just use an online calculator
https://www.bing.com/search?q=37.7%2F6.2831&PC=U316&FORM=CHROMN

- anonymous

6.0002228199455698 ?

- anonymous

yes

- Vocaloid

good! that s the radius

- anonymous

but 6 will do

- anonymous

okay? still kind of lost

- Vocaloid

you're done, you just found that the radius is equal to 6

- anonymous

I'm just a little confused how we got there lol

- anonymous

the formula you were given was C = 2πr

- anonymous

using algebra we moved our variables around to solve for r since C was given.
We divided 2π from both sides like so C/2π = 2πr/2π the 2π on the side of 2πr cancelled leaving us with C/2π = r and from there you just plugged in values C = 37.7 and 2*(3.1415) which is the value of π

- anonymous

hope that helps :)

- anonymous

i think i'm dumb cause i dont get it lol

- Vocaloid

|dw:1444525785727:dw|

- Vocaloid

|dw:1444525809654:dw|

- Vocaloid

do you understand this part?

- anonymous

yes

- Vocaloid

good, now the problem says that the circumference is 37.7, so we replace "C" with 37.7
do you understand that part?

- anonymous

yes

- Vocaloid

good, now we want to find the radius

- Vocaloid

so we want r by itself on the other side

- Vocaloid

|dw:1444526056008:dw|

- Vocaloid

do you understand that part?

- anonymous

yeah

- anonymous

it's making more sense

- Vocaloid

good, so r = C/(2π) = 6

- anonymous

\[\frac{ 1 }{ 2π } * C = 2πr * \frac{ 1 }{2π} \rightarrow r = \frac{ C }{ 2π } \]

- anonymous

heh guess I should have made a picture :)

- anonymous

I GET IT NOW!

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