In the given figure, if ∠CAD=150∘ and ∠ABC=60∘, then reflex ∠ACB=
3 right angles
∠ACB + ∠ABC= ∠DAC
[Exterior angle property]
∠ACB + 60∘=150∘ ∠ACB=90∘∴ Reflex ∠ACB =360∘−90∘ =270∘ =3×90∘ =3 right angles