1.

चित्र में `angle AOB = 150 ^(@)` तथा `angle BOC = 100 ^(@)` तब `angle ABC ` का मान ज्ञात कीजिए।

Answer» यहाँ `angle AOC=360^(@)-(100^(@)+150^(@))`
`=360^(@)-250^(@)`
`=110^(@)`
`angleABC=(1)/(2)angleAOC`
`=(1)/(2)xx110^(@)=55^(@)`


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