A right-angle triangle.
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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.
The triangle contains a 90 degree angle, making it a right-angled 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.