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Let's start with the given information:
The angles of the triangle measure (x+10)°, (x+20)°, and (x+30)°.
To find the smallest angle, we need to find the minimum value of the sum of the three angles, since the angles of a triangle must add up to 180°.
So, the sum of the three angles is:
(x+10)° + (x+20)° + (x+30)° = 3x + 60°
Since the sum of the angles of a triangle is 180°, we can set up the equation:
3x + 60° = 180°
Subtract 60 from both sides:
3x = 180° - 60°
3x = 120°
Divide both sides by 3:
x = 40°
Now we can find the smallest angle by substituting x=40° into any of the expressions for the angles:
Smallest angle = (x+10)° = (40°+10)° = 50°
So, the measure of the smallest angle is 50°.