The right isosceles triangle has 180 degrees as all triangles do
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because an isosceles triangle or any kind of triangle is 180 degrees.
Not normally but if it has angles of 90, 45 and 45 degrees it is then both a right angle and an isosceles triangle
A isosceles right angle triangle will have 2 equal interior angles of 45 degrees and 1 angle of 90 degrees with its largest exterior angle being 180 -45 = 135 degrees.
An isosceles right-angled triangle
an isosceles triangle can have any vertex angle less than 180 and greater than 0, as long the other two angles are equal. an isosceles triangle with a vertex of 179 degrees would just have the other two angles be 0.5 degrees. A right triangle with matching angles (both 45 degrees) would be both a right triangle and isosceles triangle.