Tolong di jawab beserta penjelasannya

1.∠ACB=0.5x∠AOB=0.5x84=42
   ∠POQ=2x∠PRQ=2x45=90
2.∠KML=∠KNL=0.5x∠KOL=0.5x72=36
   ∠AOB=180-(2x48)=84
   ∠ACB=0.5x∠AOB=0.5x84=42