1.

In a `DeltaABC,"if "angleA-angleB=42^(@)andangleB-angleC=21^(@)" then "angleB=?`A. `32^(@)`B. `63^(@)`C. `53^(@)`D. `95^(@)`

Answer» Correct Answer - C
`angleA=angleB+42^(@)andangleC=(angleB-21^(@))`.
`A+B+C=180^(@)implies(B+42)+B+(B-21)=180`
`implies3B=159impliesB=53^(@)`


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