I don’t know how to do this and it’s due tmmrow and I have 9 in total

Angle G=20
Because all triangles’ angles add up to 180 and
Note: Had to use < instead of the actual symbol for angle
80+80+<G=180
Set up the equation (set sides equal to 180)
160+<G=180
Simplified (add what you can)
<G=20
Subtracted 160 from both sides
Hope this helps you do the others as well