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Question
In the fig below, it is given that O is the centre of the circle and ∠AOC = 150°. Find
∠ABC.
Short Note
Solution
`we have ∠AOC= 150°`
`∴∠AOC+`(reflex)`∠AOC=360°`
`⇒150°+`reflex`∠AOC=360°`
⇒reflex `∠AOC=360°-150°`
`⇒2∠ABC=210°`
`⇒ ∠ABC=(210)/2=105°`
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