Question

Find the exact area of the region bounded by two concentric circles with radii 10 inches and 6 inches.

a) 16pi
b) 64pi
c) 88pi

Answer 1

@satellite73

Answer 2

@TheSmartOne

Answer 3

big area minus small earea

Answer 4

\[\pi r^2\] big area is
\[100\pi\]

Answer 5

small area ?

Answer 6

big area minus small area =211 right/

Answer 7

?

Answer 8

i think you are missing that there has to be a \(pi\) in the answer

Answer 9

Wait what?

Answer 10

Oh

Answer 11

\[100\pi-36\pi=?\]

Answer 12

87pi

Answer 13

So the answer is C?

Answer 14

your arithmetic is worse than mine even !!

Answer 15

Really/

Answer 16

\[100-36=?\]

Answer 17

Oh it's 77

Answer 18

lolol

Answer 19

you need a calculator

Answer 20

Sorry. I know it's like 10:30 in the morning, but it takes me awhile to wake up

Answer 21

yeah here too

Answer 22

Really?

Answer 23

http://www.wolframalpha.com/input/?i=100-36

Answer 24

let me know when you get \(64\pi\) ...

Answer 25

is this clear or no? (no is a fine answer, just asking)

Answer 26

Omg I do need a calculator

Answer 27

Ima go get one real quick off google

Answer 28

I used to be good at this

Answer 29

use the link i sent wolfram alpha is great

Answer 30

not that you need a calculator to subtract \(100-36\) but still

Answer 31

Oh okay nevermind then. I done already looked at it

Answer 32

yeash

Answer 33

I just realized that 100-30=70 and 100-36=64 cus 10-6=4

Answer 34

however you like to think about it, yes

Answer 35

Oh and can you help this one kid with his algebra? He's new to the site and he looks like he needs help

Answer 36

sure why not?

Answer 37

who is it?

Answer 38

The same kid you tried to help before. He still doesn't understand what you told him and now he's calling to me for help and I don't necessarily remember how to do this stuff

Answer 39

@satellite73