It is an obtuse triangle if its 2 other acute angles are different in sizes.
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45 degrees is an angle, not a triangle.A triangle containing an angle of 45 degrees can be any kind of triangle except an equilateral triangle.
A right-angle triangle.
A right triangle has a right angle (thus called a right triangle), 90 degrees
A right-angle triangle must have one corner of 90 degrees.
An obtuse triangle.