Answer:
u=66°
Step-by-step explanation:
let number of sides=n
sum of interior angles=(n-2)×180
2u+1+3u-49+2u+118+141+u+50+2u+16+143=(8-2)×180
10u+1-49+118+141+50+16+143=6×180
10u+ 4 69-49=1080
10u=1080-420
10u=660
u=660/10=66°
