more than 90 degrees and up to 180.
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The first part of the above is true, but the largest side can only equal up to 178 degrees. The sum of all THREE angles equals 180 (in EVERY triangle), so, logically, a single angle in a triangle cannot be 180 degrees.
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obtuse triangle
A triangle with 1 obtuse angle is called an obtuse triangle.
-- No right triangle, acute triangle, or equilateral triangle has an obtuse angle in it. -- If a triangle has an obtuse angle in it, then it's called an obtuse triangle. -- No triangle can have more than one obtuse angle in it .
Sometimes, it can or can not be a obtuse triangle.
An obtuse triangle.