In a triangle the smallest angle is always opposite the shortest side.
It will always be an acute angle.
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The shortest side of a triangle is opposite to the smallest interior angle.
54 degrees
angle
The three angles are 40, 50 and 90 degrees.
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.