Answer:
The measurement of the third exterior angle is 105°.
Step-by-step explanation:
The sum of the measures of the exterior angles of a polygon is always 360° ( However it is triangle or rectangle or etc..)
Since, a triangle has three exterior angles,
Given,
The measurement of two exterior angles of a triangle is 255°,
Let x be the third exterior angle,
Then by the above statement,
x + 255° = 360°
x = 360° - 255° = 105°
Hence, the measurement of the third exterior angle is 105°.
