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Questions  >>  Olympiad-Math  >>  Class 7  >>  Lines and Angles
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Q)

An angle is double its supplementary angle. What is the value of this angle?


$( A ) 120^{\circ} \\ ( B ) 135^{\circ} \\ ( C ) 125^{\circ} \\ ( D ) 130^{\circ} $

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A)
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If $x$ is supplementary angle, the angle is double, hence $2x$. But $x + 2x = 180$
Hence $3x = 180$
$x = \frac{180}{3} = 60$. Hence the angle ( $2x$ ) is $ 2*60 = 120$
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