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.
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It is an isosceles triangle. 45 + 45 + 90 = 180 degrees
Left triangle.
They are: 90 degrees, 45 degrees and 45 degrees
That is a icocsles triangle.
It is an obtuse triangle