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