The sum of the angles in a triangle is always 180°.
To find the measurement of the third angle, you can use the following formula:
\[ \text{Third angle} = 180° - (\text{First angle} + \text{Second angle}) \]
In this case, the first angle is 35° and the second angle is 40°:
\[ \text{Third angle} = 180° - (35° + 40°) = 180° - 75° = 105° \]
Therefore, the measurement of the third angle is 105°.