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किसी ABC त्रिकोण में कोण `angleA+angleC=140^(@)` यव कोण `angleA + 3angleB=180^(@)` तो कोण A किसके बराबर होगा ?

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किसी ABC त्रिकोण में कोण `angleA+angleC=140^(@)` यव कोण `angleA + 3angleB=180^(@)` तो कोण A किसके बराबर होगा ?
A. `80^(@)`
B. `40^(@)`
C. `60^(@)`
D. `20^(@)`
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1 Answer

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Correct Answer - B
`angleA + angleB +angleC=180^(@)`
`angleA+3angleB=180^(@)`
`angleA + 120^(@) = 180^(@)`
`rArr angleA=60^(@)`
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