115 degrees is an obtuse angle
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No, an obtuse triangles has one obtuse angle and two acute angles. If a triangle has an obtuse angle, it is considered obtuse and cannot be acute.
An obtuse angle has no complementary angle.
Acute
It is an obtuse triangle having 1 obtuse angle and 2 different acute angles Or it is an isosceles triangle having 1 obtuse angle and 2 equal acute angles
An obtuse angle is an angle more than 90 degrees but an acute angle is an angle less than 90 degrees.