The sum of the interior angles of a triangle is 180°. Let the third angle be _x_. Then 75° + 64° + _x_ = 180°. So, _x_ = 180° - 75° - 64° = 41°.
The exterior angle of a triangle is equal to the sum of the two non-adjacent interior angles. Therefore, the exterior angle is 75° + 64° = 139°.
139
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