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2pi(2) + 2pi(3)
------------- is this right?
2

for part (i)

all you have to do is add your r's
and then multiply the result by pi

Ahhh I see! That makes sense!

like I started with the one formula
change of area
divided by
change or radi

\[\text{ average rate iof change of area}=\frac{A(r_1)-A(r_2)}{r_1-r_2}\]

but was able to simplify this to that really pretty formula

Right, and that gives us the avg rate of change of area

Oh that sure is a beautiful formula *_*

Ohhh true!!

how do you type text like that in the formula thing?

yeah but it always italicises the text

\[\frac{ \text{ kitty eats kitten food} }{\text{ how to do } 5+\frac{6}{7} \text{ in a fraction }}\]

\frac{ \text{ kitty eats kitten food} }{\text{ how to do } 5+\frac{6}{7} \text{ in a fraction }}

how do you write normal text like that inside the equation thing?

:) yes lol
|dw:1433574618995:dw|
put around that
just wherever you want text do \text{ }

Oooooh how did you know that?? :O

oh thanks so much

just a little experience with LaTeX

I had to look up some things and also there is a LaTeX group if you want to get really good at it

Awesomeness ;D

Oh is there?

Thats great!! Thanks for the link! It'll be useful! :D

By the way I do not claim to be a genius at it

I just know some basic things

It's still a lot more that I know :P

than*

The "beautiful formula" thing kinda made me laugh. :P
Nice explanation though. :)

awww how kind

^_^ just being honest :D

goodnight and thanks
good luck with calculus

It was no problem

:) Sleep well