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jhonyy9
because an angle of 180 degrees mean a line so this not will be possible never true to being an exterior angle of a triangle 

hope this is understandably 
taskmasters
An exterior angle of a triangle is 180 degrees is never true. The simple reason behind this logic is that 180 degrees means a straight line and it is not possible for a straight line to create an exterior angle of a triangle. I hope that this answer will come to your help.

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