Answer:
First we have to calculate z
z + 69° = 180°
z = 180° - 69° = 111°
Now that we have 2 out of 3 angle already, we can easily calculate x which is the measurement of the third angle we are looking for:
23° + 111° + x = 180°
x = 180° - 23° - 111°
x = 46°
