Question

In fig., O is the centre of the circle and ∠ AOC = 1500. Find ∠ ABC. 

Answer 1

∠ AOC = 150 °  

Reflex ∠ .AOC = 360° - 150° = 210° 

∠ ABC = `1/2` reflex ∠ AOC = `1/2` (210°} 

∠ ABC= 105°