Someone please help me to solve this sum! In the figure,EADH and FBCG are straight lines. Find n.PS Its better to show all steps and in English.Thanks.

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Someone please help me to solve this sum!
 

 
In the figure,EADH and FBCG are straight lines. Find n.
PS Its better to show all steps and in English.Thanks.

360-110-60-35=155(四边形内/外角和360)

n=155

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