Format the hard drive and reinstall Mac OS X if i have lost the dvd's

Hi
I own a 2011 macbook pro 17" and it my disk is almost full so the computer is frezzing all the time and stuff. So i thought of formatting the drive and reinstalling the OS but i can't find the dvd's that came with it and i'm really not sure if there were any dvd's that came with it. Why do I do?
I have a friend who has a 2011 macbook pro 13". Will his dvd's work on mine?
Any help would be appreciated
Thanks

adrianlazlow wrote:
my disk is almost full so the computer is frezzing all the time
Reduce data off of it so it's less than 80% filled, use a external drive.
That's all you need basically.
Most commonly used backup methods
Why is my computer slow?

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