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Sum of all the angles in the triangle has to be 180 degrees.
Let's mark the largest angle as x.
Then, smallest angle will be 0.5x and the middle one x-25.
x + 0.5x +x - 25 = 180, which is after simplyfying:
2.5x = 205
x = 82 degrees -> the largest angle,
x-25 = 57 degrees -> middle one,
0.5x = 41 degrees -> the smallest angle.
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