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

Find the supplement of the angle $\large\frac{4}{5}$ of $90^{\circ}.$


$( A ) 108^{\circ} \\ ( B ) 75^{\circ} \\ ( C ) 72^{\circ} \\ ( D ) 110^{\circ} $

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A)
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  • Two angles are supplementary when the sum of the angles is $180^{\circ}$
One angle is $\frac{4}{5} * 90 = \frac{4}{5} * 5 * 18 = 4 * 18 = 72^{\circ} $
Hence the supplementary angle is $180 - 72 = 108^{\circ}$
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