yes that would be an obtuse angle!
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92 degrees is on possibility. The answer is NOT "an obtuse angle". An angle of 90.5 degrees, for example, is an obtuse angle but is not included in the range specified in the question.
That would be 69.
0.0179
In any triangle, the sum of all three interior angles is 180 degrees.In an isosceles triangle, two of the three angles are equal.We know the 92 can't be one of the two equal angles, because if it were, then the 2 equal angles would add up to 184. The two equal angles must make up what's left of the 180 after you take out the 92.So the two mystery angles are [ 1/2 (180 - 92) ] = [ 1/2 (88) ] = 44 and 44.
That would be 92, so 81 would be your answer.