Right triangles.
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It is an isosceles triangle. 45 + 45 + 90 = 180 degrees
45 degrees.
They are: 45, 45 and 90 degrees
If a triangle is an isosceles triangle as well as being a right-angled triangle, the size of the two angles (that are not right angles) are 45 degrees.
180 Two angles are 45 degrees and between them the third angle is 90 degrees.