If you mean 181 degrees then it is impossible because the 3 interior angles of any triangle will always add up to 180 degrees.
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Below is the link to a sweet video on how to make the impossible triangle.
it is impossible* * * * * Although it is impossible to have a triangle with no sides or angles congruent to anything else in the 2-d world, I suggest that the answer to this question is a scalene triangle.
This is an impossible triangle as the sum of all three angles in a triangle sum to 180o
It is impossible to find the height of a triangle with just it's base.
It is impossible for a triangle to have any parallel sides. ■