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1) sum of exterior angle= 360
110+50+90+x=360
250+x=360
x= 360-250
x= 110
2) number of side =360/n
360/45
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Sum of exterior angle = 360°
ATP
50+110+90+x = 360
=) 250+x = 360
=) x = 360-250 = 110
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