Comment
When an exterior angle is given, its complement can the found with the following formula.
Exterior angle + the supplement interior angle = 180
Because the exterior angle is given, we can find the base angles and later on the apex angle.
Solution
125 + x = 180 Subtract 120
x = 180 - 125
x = 55
The other base angle = 55
A triangle has 180 degrees
55 + 55 + apex angle = 180
110 + apex angle = 180
apex angle = 180 - 110
apex angle = 70 <<<<< Answer.
I'm not getting any of those. This is not ASAP. If you've put in something wrong let me know.
