180 degrees and 115 degrees
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90° . That's true of any triangle. Doesn't have to be isosceles.
It is an isosceles right angle triangle.
A right angle triangle with 45, 45 and 90 degree angles is similar to an isosceles triangle
A triangle with a 90 degree angle and two 45 degree angles.
An isosceles triangle has 3 interior angles that add up to 180 degrees two of which are equal in size.