how to detect lonGest Line and Find its slope to horizontal axis

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Amr Essam el 18 de Feb. de 2015

i have image

Scanned From Scanner

and Becouse Of humans Errors it May Be Rotatated

i Think i can detect this Rotation By this Line and Calculate its Slope to horizontal

First : how can detect this Line ( longest Line ) image

second : how Could i Calculate its slope and Correct it

thanks in advance ^_^ ^_^

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