Answer:
Explanation:
There are just two triangles stuck together , here. Don't let that throw you off your game :DD
solve for a
then b
for a it's 180 = 2*36 +a ( b/c of the red marks , again)
180 = 72 +a
180-72 =a
108 = a
Now solve for b
180 = 2b + 42 (red marks tell us this formula works, again)
180-42 = 2b
138 =2b
138/2 =b
69 = b
Do you see , now, how I get those formulas???