Question

In the fig below, it is given that O is the centre of the circle and ∠AOC = 150°. Find
∠ABC.

Answer 1

`we   have ∠AOC= 150°`

`∴∠AOC+`(reflex)`∠AOC=360°`

`⇒150°+`reflex`∠AOC=360°`

⇒reflex `∠AOC=360°-150°`

`⇒2∠ABC=210°`

`⇒ ∠ABC=(210)/2=105°`