What is the measure of angle 3?

The measure of angle 3 in the given diagram with relevant parameters is; 115°
We are given that;
angle 6 = (2x - 5)°
angle 8 = (x + 5)°
We know that sum of angles in a straight line is 180°. Thus;
2x - 5 + x + 5 = 180
3x = 180
x = 180/3
x = 60.
Now, Angle 3 is an alternate interior angle to angle 6 which means it is equal to angle six.
Thus;
angle 3 = angle 6 = 2(60) - 5 = 115°
Read more about angle measure at; https://brainly.com/question/2009183