1.

`angleA + 1/2 angleB+ angleC=140^(@)`, then `angleB` is `angleA +1/2angleB + angleC=140^(@)`, हे, तब `angleB` हे।A. `50^(@)`B. `80^(@)`C. `40^(@)`D. `60^(@)`

Answer» Correct Answer - B
According to question,
`angleA + 1/2 angleB+ angleC = 140^(@)`………….(i)
As we know that
`angleA+angleB+angleC=180^(@)` ……………(iii)
Compare equation (i) and (ii)
`1/2angleB= 40^(@)` `angleB=90^(@)`


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