An isosceles right angled triangle
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It is an isosceles triangle. 45 + 45 + 90 = 180 degrees
Right triangles.
They are: 45, 45 and 90 degrees
45 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.