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Geometry 

 Jan 24, 2018
 #1
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Notice that   angle ABE and FDE are alternate interior angles and thus, they are equal

 

And angle CDE  is supplemental to FDE

 

So....

 

CDE  + FDE  =  180

 

CDE   +  30  =   180     subtract 30 from both sides

 

CDE  =   150   =  "y"

 

 

cool cool cool

 Jan 24, 2018

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